8. -What do you think are the main environmental problems for us now?

-　　　 , the most urgent problem of all is global warming.

A. After all

B. In a nutshell

C. By the way

D. What’s more

7. Bill told us his terrible experience 　　　in a heavy rain.

A. to catch

B. to be catching

C. to have been caught

D. to have caught

6. When I showed my students the photos taken in the USA, they couldn’t help 　　　the wonderful life there.

A. imagine　　　　 B. to imagine　　　 C. but imagine　 D. but to imagine

5. Our government was 　　　about the rising house price.

A. concerning　　 B. concerned　　　　 C. cared　　　　 D. troubled

4. I feel very satisfied with the situation 　　　I can sleep for more than 10 hours every day.

A. which　　　　　 B. that　　　　　　 C. when　　　　　 D. where

3. We should put some green plants in our living room because they can 　　　carbon dioxide and give out oxygen.

A. take over　　　 B. take off　　　　 C. take on　　　 D. take in

2. Students always 　　　that they have taken so many loads on their shoulders that they can hardly breathe.

A. complain　　　 B. puzzle　　　　　 C. explain　　　 D. quarrel

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. Can you describe the effect that taking part-time jobs has　　　 your study?

A. to　　　　　　 B. for　　　　　　 C. in　　　　　 D. on

5. 你最好戴上面罩以防把沙尘吸入肺部。(prevent ...from)

提升练习

4. 保护环境是一项艰辛的任务，因此除了努力，我们别无选择。(can’t choose but)