7. We suggest that they provide an effective warning system to 　　　　many of the disasters　　　　 .

A. keep; happening

B. prevent; from happening

C. stop; from being happened

D. prevent; from being happened

6. She started as an office junior, and　　　　 　became the director of the whole company.

A. in surprise　　　　　　　　 B. in return

C. in turn　　　　　　　　　　 D. in time

5. Freezing winter is harmful　　　　 　orange trees.

A. for　　　　　 B. to　 　　　　　C. of 　　　　　　　D. at

4. The villagers were often in 　　　　clashes with each other in those years before the agreement was reached.

A. interesting　　　　　　　　 B. peaceful

C. violent　　　　　　　　　　 D. spiritual

3. He exists 　　　　bread and water.

A. on　　　　　 B. in　　　　　 C. by　　　　　　 D. with

2. The boiler from excessive pressure of steam　　　　 .

A. exploded　　 B. burst　　　　 C. explode　　　　 D. erupt

从A、B、C和D四个选项中，选出可以填入空白处的最佳选项。

1. It was reported that a plane crash happened last night and most of the passengers were badly 　　　　and some 10 died.

A. damaged　　　　　　　　　 　B. injured

C. destroyed 　　　　　　　　　D. harmed

5. 我们要相信形势会好转的。(depend on)

提升练习

4. 他被迫放弃了自己的梦想。

3. 吸烟有害健康。