Passage 1
The White House is the most visited residence in the world.Tours may be scheduled through our Washington DC office. Due to security and scheduling procedures, there are a few things you should know before requesting a tour：
• Only groups of 10 or more may request a tour.
• Requests must be submitted with a minimum of one month's advance notice from the date of the tour. Notice of whether your application is accepted will be given 10 days prior to the date requested. All tours, even after they have been confirmed, are subject to cancella-tion due to security interests.
• Tours are only conducted Tuesday through Saturday from 7:30 am to 11:30 am. To process your request for a tour, please contact our Washington office at (202) 2245521 and provide the following information：
• Date(s) requesting.
• Security information for each person in your party, including： name as it appears on ID. (I.D. required for ages 14 and up), date of birth, social security number, country of origin, and citizenship (公民的身份）.
• A home address and daytime and evening phone numbers for the designated (指派的) leader of the group.
• A contact number while in DC for the designated leader of the group.
After your request, our office will contact you with further instructions.
15.It can be inferred from the passage that_____.