Unit 1
1. Lively behavior is normal for a four-year-old child.
2. Fast cars appeal to John, but he can’tafford me.
3. Dave required a lot of time to study the diverse arguments.
4. I asked my boss for clarification, and she explained the project to me again.
5. Photographic film is very sensitive to light.
6. Mutual encouragement can be a great help, especially in the early days.
7. Jimmy cried when people made fun of him.
8. John won't give up. He persists in his opinion/viewpoint.
9. Ted always wants to be the focus/center of attention.
10. Is it cheap if we buy our tickets in advance?

Unit 2
1.However, the main drawback with this type of search engine is its tendency to include too much information.
2.She's very generous with her time----always ready to help other people.
3.You may have known someone else 20 years and yet they will never be more than a casual acquaintance.
4.He doubted that the car was hers because everybody knew she had no money.
5.It's impossible to forget such horrific events----they will remain in the memory forever.
6.In a world too often filled with uncertainties, it is nice to have a safety net, something you can rely on.
7.The earthquake happened a year ahead of the prediction by the research group, but earthquakes are usually difficult to predict.
8.I don't mind being awakened once or twice in the middle of the night by my roommate so long as she doesn't make a habit of it.

Unit 3
1.Their study shows that sports skills carry over into personal life.
2.I find myself calling on the boys more often, because they tend to be the ones having trouble staying on task.
3.I used to have trouble getting all the laundry put away before it was time to do the next batch.
4.After her time in hospital, Jenny’s parents are afraid she has fallen behind academ
ically.
5.People are wondering who's going to take over when the old president dies.

Unit5
1. One of the reasons that they became good friends;
2. not by repeating the others' footprints.
3. which means he will miss the world cup.
4. whether to express her missing him or to keep silent.
5. the days she stayed with her dad in the rural when she was a small girl.
6. Whatever the reseach result was how meaningless,
7. Always being criticized by parents,
8. Overdone danger

Unit 6
1.He was finally offered the job on the strength of his good memory and the many exams he had passed. (凭借他的记忆力好)
2.She favors a bit of adventure as well as a certain degree of self-government when her children's education is concerned. (当涉及到她孩子的教育时)
3.Most people who are sick with AIDS want to stay at home, rather than spend time unnecessarily in hospital. (而不愿意毫无必要地呆在医院里)
4.What if I choose to give small amounts of money regularly over a period of time instead of donating a large sum once for all? (在一段时间内定期给少量的钱)
5.I am afraid, Mr. Peterson, the answer is that we have to be more efficient than our European competitors. （答案是这样的）
6.The museum does not intend to focus on a particular aspect of modern art, but prefers to offer material for the public to study and compare. （并不打算只关注先代艺术的某个具体方面）
7.She has decided not to go for a drive on such a windy day even supposing a car was available. （即使能搞到一辆车）
8.I am well aware of the fact that you have cut yourself off from your past and have started a totally new life. （你已经和过去一刀两断，并已经开始全新的生活这一现实）