Jack moved to Paris. He lost contact with most of his former friends, (complex sentence)

David made a beautiful musical album. He gave it to his girlfriend as a birthday gift, (simple sentence)

Computers can perform many tasks nowadays. Computers cannot replace people or behave in the way a human mind works, (complex sentence)

Virtual reality, unlike real reality, enables us to experience things through the computer. Those things don’t really exist. Virtual reality will probably change our thinking patterns, (compound-complex sentence)

Mothers want to keep working usually find that they are facing strong pressure to balance between work and family.

A recent study shows that reading in print is better for understanding than to read on a Kindle or other electronic devices.

Humans, like other animals, have a biological clock that tells us when to sleep and when to eat, our bodies are controlled by the clock in many ways.

While watching the movie, sweet memories of the days in the forest with her father were brought to mind.

Thousands of people register for continuing education classes each year. To learn new skills or to improve their lives.

Read the following paragraph and underline the topic sentence. 　The very act of stepping outside of your comfort zone is critical to your success. Our brains are wired so that it’s difficult to take action until we feel at least some stress and discomfort. In fact, performance peaks when we’re well out of our comfort zone. If you’re too comfortable, your performance suffers from inaction; if you move too far outside of your comfort zone，you melt down from stress. Stepping outside of your comfort zone makes you better, and it doesn’t have to be something as extreme as climbing Mount Everest. It’s the everyday’s challenges that push your boundaries the most, none of which require a flight to Nepal. Just embrace these challenges since no one has ever accomplished anything remarkable when comfortable.