5. Finland gained ____________ (independent) from Russia during the First World War.

4. You’d better not get_________ (annoy) at his ignorance.

3. I’m afraid it’ll be very hard for you ________ (adapt) this story for children.

2. When something can help people or improve their lives, we say it is ________ (有益的) to people.

1. As he has no opportunity to achieve his a________, he intends ________ (resign) from the company. 　

With the (1) ____________ (develop) of industry, air pollution is getting more and more serious. In Beijing, many people suffer different kinds of illnesses because (2) ____________ air pollution.

Air pollution is caused by the following (3) ____________: about half of the problem is caused by vehicles. There are more and more cars, buses on the roads, and they give off 　(4) ____________ (poison) gases. 25% of air pollution is caused by factories. Another factor is the smokers. Smoking not only does harm to their health (5) ____________ to others. (6) ____________ these, about 10% of air pollution is caused by other reasons.

We should take some measures to fight (7) ____________ pollution. New fuel can be used to take (8) ____________ place of gas. We can plant more trees. If everybody realizes the (9) ____________ (important) of environment and does something to stop pollution, the problem will be (10) ____________ (solve).

10. 倘若外援枯竭，形势将极为严重。If foreign aid (19) ____ (20) ____ the situation will be desperate.

9. 他们那时听不到她的消息, 唯恐发生了最糟的事.。When they did not (17) ____ (18) ____ her, they feared the worst.

8. 海伦那天借走了我的书, 说很快就还。Helen borrowed my book (14) ____ (15) ____ (16)____, saying that she would return it soon.

7. 爬爬那座山就知道谁行谁不行了. Climbing that mountain will certainly (12) ____ (13) ____ the men from the boys.