Read the following paragraph and underline the topic sentence.

Computers are useful in many ways. As we all know, scientists use computers to run experiments, analyze data, and solve large equations. Engineers use computers to automatically control complicated industrial production, design circuits and machine parts or even spaceships. Writers and editors use computers to write books, edit newspapers and magazines. And office workers use computers to manage files, send and receive e-mails, conduct statistical surveys of all kinds of information, etc. The list of computer applications is really endless, and more new applications are still developing.

Write a letter according to the following situation: Your name is Wang Tao. You are the dean of Biology Department, Beijing University of Medical Science. You heard from Prof. David Zhang that Prof. Paul Johnson, Chief Director of Genetic Engineering Lab, University of Pennsylvania, was coming to China. Write letter to invite him to give some lectures to the staff and students in your department. (150-200 words)

Youth workers Bill Nash and Jim Boyle are house-hunters, not so much for a house as for a concerned family willing to house and feed troubled youngsters temporarily. They try to give prompt(及时的) attention to those who cannot or will not live at home. There are numerous parents who want to find houses for their children to live in by themselves.

For some, leaving home may have been the result of a hasty decision, based on a scorching(灼热的的) remark and the subsequent tempest(风暴) within the family. The cooling-off period away from the family is the time to soothe(安抚) feelings. With sympathetic outsiders, youngsters have a chance to redeem(弥补) themselves. The hope, of course, is that they will learn to relate to adults again and quickly resume the normal life of harmony with their own families.

Some people refrain from offering their homes, expressing vague fears of the harmful effects on their own children. But this has not been the case, even when the problem of the “visitor” was the illegal use of narcotics(麻醉剂). One parent remarked, “With us, it worked the other way. The horror of drugs became real to my own son. We got a lot more than we gave.” The “visitor” really helped the family avoid the danger of becoming drug addicts.

19. The reason was never explained to us.

20. My father had taught me, on his lap, before I started school—A Child's Garden of Verses, and Eugene Field, his favorite poet.

21. I remember a storybook, which soon disappeared, about some Belgian children along a canal escaping from Germans.

22. At any rate, these are all the books I recall from my childhood household.

23. From an early time, I had been a great reader.

24. A few volumes had come with us, I think, from Seattle to Minneapolis, but they were for looking at the pictures on the living-room floor while a grown-up watched, not for reading.

25. But after our parents' death, almost no books were permitted.

26. Was it to save electricity, or because books could give “ideas” that would make us too big for our boots?

Read the following paragraph carefully and choose the best topic sentence from the four possible answers that follow the paragraph by writing A, B, C or D.

Topic Sentence:__________

From Suburbia to the inner city, bicycle sales are booming. Bicycling seems to have an appeal to people of all ages. It has especially caught on with those who don't want to get into jogging but who still want to get their bodies in shape. The latest physiological research indicates runners and cyclists have much in common in the results obtained, such as good physical fitness, lean and tightened muscles, an air of exhilaration, pride of accomplishment, and mental alertness. Those who enjoy bicycling say it is simple, inexpensive, easy, natural, and never boring. Those who excel in the art of cycling say the secret is pace—the steady, rhythmic movement of legs. They say it is acquired through practice and once mastered, enables one to consistently cycle farther, longer and more easily, and feel better.

A. Jogging also has an appeal to people.

B. It is not easy to learn the art of cycling.

C. One of the newest crazes to hit the modern American public is bicycling.

D. Many new crazes hit the modern American public now.

Read the following paragraph and underline the topic sentence.

Computers are useful in many ways. As we all know, scientists use computers to run experiments, analyze data, and solve large equations. Engineers use computers to automatically control complicated industrial production, design circuits and machine parts or even spaceships. Writers and editors use computers to write books, edit newspapers and magazines. And office workers use computers to manage files, send and receive e-mails, conduct statistical surveys of all kinds of information, etc. The list of computer applications is really endless, and more new applications are still developing.

Choose the best topic sentence from the group below by writing A, B, C or D.

A. You can review it a few hours in the night before the test.

B. You can study with friends and help each other.

C. You can get up early in the morning of the test and study.

D. There are many ways to study for a test.

Answer:__________

With his bicycle broken, he walks to do the shopping, go to school and to fetch the stuffs he needs next day.

My brother's house is on Alp Street. Which is getting new sewers next week.

With so many questions which remained unanswered. He decided to stay in the lab.

I enjoy walking through the wood every afternoon there are peacefulness and silence that I love.