In our online life, we need to use passwords frequently. We use passwords_____（21）e-mail, gaming sites, social networking sites, and other shopping sites._____（22）, the passwords most people use are not very_____（23）and can easily be"broken"by others. In fact, the most commonly used passwords are so simple that it requires very_____（24）effort to figure them out. Can you guess_____（25）the most commonly used passwords are?They are：Names of baseball teams, birth dates of a family_____（26）, the year of a special sports event, the random numbers like 156468, _____（27）the name of a friend, pet, favorite TV star, or band.There are programs_____（28）to break into people's online accounts. These programs are_____（29）of trying every word in the English dictionary and the dictionaries_____（30）many foreign languages, in their effort to break into an account._____（31）can even search words backward. Some will try_____（32）words or words that are followed by numbers, _____（33）school222. These programs can test millions of passwords in a few minutes. So, you are advised to be careful about_____（34）passwords so that they will be hard to break. You are also advised not to make them_____（35）hard to remember. Meanwhile, you need to change them once in a while.28._____

In our online life, we need to use passwords frequently. We use passwords_____（21）e-mail, gaming sites, social networking sites, and other shopping sites._____（22）, the passwords most people use are not very_____（23）and can easily be"broken"by others. In fact, the most commonly used passwords are so simple that it requires very_____（24）effort to figure them out. Can you guess_____（25）the most commonly used passwords are?They are：Names of baseball teams, birth dates of a family_____（26）, the year of a special sports event, the random numbers like 156468, _____（27）the name of a friend, pet, favorite TV star, or band.There are programs_____（28）to break into people's online accounts. These programs are_____（29）of trying every word in the English dictionary and the dictionaries_____（30）many foreign languages, in their effort to break into an account._____（31）can even search words backward. Some will try_____（32）words or words that are followed by numbers, _____（33）school222. These programs can test millions of passwords in a few minutes. So, you are advised to be careful about_____（34）passwords so that they will be hard to break. You are also advised not to make them_____（35）hard to remember. Meanwhile, you need to change them once in a while.29._____

In our online life, we need to use passwords frequently. We use passwords_____（21）e-mail, gaming sites, social networking sites, and other shopping sites._____（22）, the passwords most people use are not very_____（23）and can easily be"broken"by others. In fact, the most commonly used passwords are so simple that it requires very_____（24）effort to figure them out. Can you guess_____（25）the most commonly used passwords are?They are：Names of baseball teams, birth dates of a family_____（26）, the year of a special sports event, the random numbers like 156468, _____（27）the name of a friend, pet, favorite TV star, or band.There are programs_____（28）to break into people's online accounts. These programs are_____（29）of trying every word in the English dictionary and the dictionaries_____（30）many foreign languages, in their effort to break into an account._____（31）can even search words backward. Some will try_____（32）words or words that are followed by numbers, _____（33）school222. These programs can test millions of passwords in a few minutes. So, you are advised to be careful about_____（34）passwords so that they will be hard to break. You are also advised not to make them_____（35）hard to remember. Meanwhile, you need to change them once in a while.30._____

In our online life, we need to use passwords frequently. We use passwords_____（21）e-mail, gaming sites, social networking sites, and other shopping sites._____（22）, the passwords most people use are not very_____（23）and can easily be"broken"by others. In fact, the most commonly used passwords are so simple that it requires very_____（24）effort to figure them out. Can you guess_____（25）the most commonly used passwords are?They are：Names of baseball teams, birth dates of a family_____（26）, the year of a special sports event, the random numbers like 156468, _____（27）the name of a friend, pet, favorite TV star, or band.There are programs_____（28）to break into people's online accounts. These programs are_____（29）of trying every word in the English dictionary and the dictionaries_____（30）many foreign languages, in their effort to break into an account._____（31）can even search words backward. Some will try_____（32）words or words that are followed by numbers, _____（33）school222. These programs can test millions of passwords in a few minutes. So, you are advised to be careful about_____（34）passwords so that they will be hard to break. You are also advised not to make them_____（35）hard to remember. Meanwhile, you need to change them once in a while.31._____

In our online life, we need to use passwords frequently. We use passwords_____（21）e-mail, gaming sites, social networking sites, and other shopping sites._____（22）, the passwords most people use are not very_____（23）and can easily be"broken"by others. In fact, the most commonly used passwords are so simple that it requires very_____（24）effort to figure them out. Can you guess_____（25）the most commonly used passwords are?They are：Names of baseball teams, birth dates of a family_____（26）, the year of a special sports event, the random numbers like 156468, _____（27）the name of a friend, pet, favorite TV star, or band.There are programs_____（28）to break into people's online accounts. These programs are_____（29）of trying every word in the English dictionary and the dictionaries_____（30）many foreign languages, in their effort to break into an account._____（31）can even search words backward. Some will try_____（32）words or words that are followed by numbers, _____（33）school222. These programs can test millions of passwords in a few minutes. So, you are advised to be careful about_____（34）passwords so that they will be hard to break. You are also advised not to make them_____（35）hard to remember. Meanwhile, you need to change them once in a while.32._____

In our online life, we need to use passwords frequently. We use passwords_____（21）e-mail, gaming sites, social networking sites, and other shopping sites._____（22）, the passwords most people use are not very_____（23）and can easily be"broken"by others. In fact, the most commonly used passwords are so simple that it requires very_____（24）effort to figure them out. Can you guess_____（25）the most commonly used passwords are?They are：Names of baseball teams, birth dates of a family_____（26）, the year of a special sports event, the random numbers like 156468, _____（27）the name of a friend, pet, favorite TV star, or band.There are programs_____（28）to break into people's online accounts. These programs are_____（29）of trying every word in the English dictionary and the dictionaries_____（30）many foreign languages, in their effort to break into an account._____（31）can even search words backward. Some will try_____（32）words or words that are followed by numbers, _____（33）school222. These programs can test millions of passwords in a few minutes. So, you are advised to be careful about_____（34）passwords so that they will be hard to break. You are also advised not to make them_____（35）hard to remember. Meanwhile, you need to change them once in a while.33._____

In our online life, we need to use passwords frequently. We use passwords_____（21）e-mail, gaming sites, social networking sites, and other shopping sites._____（22）, the passwords most people use are not very_____（23）and can easily be"broken"by others. In fact, the most commonly used passwords are so simple that it requires very_____（24）effort to figure them out. Can you guess_____（25）the most commonly used passwords are?They are：Names of baseball teams, birth dates of a family_____（26）, the year of a special sports event, the random numbers like 156468, _____（27）the name of a friend, pet, favorite TV star, or band.There are programs_____（28）to break into people's online accounts. These programs are_____（29）of trying every word in the English dictionary and the dictionaries_____（30）many foreign languages, in their effort to break into an account._____（31）can even search words backward. Some will try_____（32）words or words that are followed by numbers, _____（33）school222. These programs can test millions of passwords in a few minutes. So, you are advised to be careful about_____（34）passwords so that they will be hard to break. You are also advised not to make them_____（35）hard to remember. Meanwhile, you need to change them once in a while.34._____

In our online life, we need to use passwords frequently. We use passwords_____（21）e-mail, gaming sites, social networking sites, and other shopping sites._____（22）, the passwords most people use are not very_____（23）and can easily be"broken"by others. In fact, the most commonly used passwords are so simple that it requires very_____（24）effort to figure them out. Can you guess_____（25）the most commonly used passwords are?They are：Names of baseball teams, birth dates of a family_____（26）, the year of a special sports event, the random numbers like 156468, _____（27）the name of a friend, pet, favorite TV star, or band.There are programs_____（28）to break into people's online accounts. These programs are_____（29）of trying every word in the English dictionary and the dictionaries_____（30）many foreign languages, in their effort to break into an account._____（31）can even search words backward. Some will try_____（32）words or words that are followed by numbers, _____（33）school222. These programs can test millions of passwords in a few minutes. So, you are advised to be careful about_____（34）passwords so that they will be hard to break. You are also advised not to make them_____（35）hard to remember. Meanwhile, you need to change them once in a while.35._____

Passage OneSound sleep occurs when one's internal clock is regulated. Circadian rhythms（生理节奏）can become compromised quite easily. Many people with sleep troubles tend to vary bedtimes. To avoid this common problem, sleep sufferers should go to bed and wake up at the same time every day. to help improve circadian rhythms, sufferers should enjoy 15 minutes of sun exposure the first thing in the morning.A bedtime routine can help prevent insomnia（失眠）. One hour before bedtime, one should lower the lights and relax. Reading a book or listening to calm music can help prepare the body for a good night's sleep. Taking a warm, candlelit bath or drinking a cup of warm milk can also help you prepare for deep sleep at night.Stress can have a bad effect on the body and the ability to sleep. A daily exercise routine can help lower the body's stress naturally. One can also manage stress by writing diaries. Writing diaries can help people express their anxieties, plan for the future and improve sleep. Other ways to lower stress include deep breathing exercises and progressive muscle relaxation.The light sending out from computers, cellphones, tablets and televisions can cause sleep problems. Therefore, these items should be turned off at least an hour before bedtime. Additionally lowering the backlight on these electronic devices earlier in the evening can help you fall asleep faster and stay asleep longer once bedtime arrives.A perfect bedroom invites sweet sleep. Most people sleep better in a cool, dark, and quiet room. Lower the temperature in the room to 16~20 degrees for a peaceful night's sleep. A dark room can be accomplished by installing light blocking curtains or wearing a sleep mask. Noise can be reduced with either earplugs or a white noise machine. Finally, a comfortable mattress（床垫）and pillows are essential to a good night's sleep.What is the passage mainly about?

Passage OneSound sleep occurs when one's internal clock is regulated. Circadian rhythms（生理节奏）can become compromised quite easily. Many people with sleep troubles tend to vary bedtimes. To avoid this common problem, sleep sufferers should go to bed and wake up at the same time every day. to help improve circadian rhythms, sufferers should enjoy 15 minutes of sun exposure the first thing in the morning.A bedtime routine can help prevent insomnia（失眠）. One hour before bedtime, one should lower the lights and relax. Reading a book or listening to calm music can help prepare the body for a good night's sleep. Taking a warm, candlelit bath or drinking a cup of warm milk can also help you prepare for deep sleep at night.Stress can have a bad effect on the body and the ability to sleep. A daily exercise routine can help lower the body's stress naturally. One can also manage stress by writing diaries. Writing diaries can help people express their anxieties, plan for the future and improve sleep. Other ways to lower stress include deep breathing exercises and progressive muscle relaxation.The light sending out from computers, cellphones, tablets and televisions can cause sleep problems. Therefore, these items should be turned off at least an hour before bedtime. Additionally lowering the backlight on these electronic devices earlier in the evening can help you fall asleep faster and stay asleep longer once bedtime arrives.A perfect bedroom invites sweet sleep. Most people sleep better in a cool, dark, and quiet room. Lower the temperature in the room to 16~20 degrees for a peaceful night's sleep. A dark room can be accomplished by installing light blocking curtains or wearing a sleep mask. Noise can be reduced with either earplugs or a white noise machine. Finally, a comfortable mattress（床垫）and pillows are essential to a good night's sleep.According to Paragraph 2, which of the following may lead to insomnia?