5. To keep market prices steady, the government should first keep demand and supply　　 .

A. stocked　　　

B. preserved

C. provided　　

D. balanced

4. As parents, you should, whether successful or not,　　 　your children from smoking.

A. discourage

B. disagree

C. disturb　　　

D. dislike

3. It is well-known that advertising is often the most effective method of　　　 .

A. motivation　

B. extension

C. contribution　

D. promotion

2. -Why are you late again?

-I’m sorry, the lift had broken down and I was　　　　 　inside.

A. injured

B. trapped

C. protected

D. blocked

从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。

1. The crew of this ship　　　　 　eight sailors, who 　　　very experienced in voyages.

A. is; is

B. is; are

C. are; is　　　

D. are;are

5. 尽管有暴风雨，他们还是冒险驾车赶路。(risk)

提升练习

4. 全部读完那些文件后，这个律师提出了一些建议。(come up with)

3. 这是我们的电话号码，如果有紧急情况，你可以拨打。(in case of)

2. 他的父亲劝他不要在大城市工作。(discourage sb. from doing)

1. 当选择一种工作的时候，要花些时间权衡一下其优势和劣势。(balance)