题目内容：

People usually check whether their keys, purses and phones are with them before going out, but many people in China now have one more important thing to take—a mask(口罩). They hope it can protect them ______ terrible air.

Many cities in China saw a lot of foggy days in April. In Beijing, there were eight days in April full of smog. It is dirty air ______ looks like a mixture of fog and smoke. The smoke is mainly from cars and factories in cities. Poor air is bad for people's health，______ for children and old people. They fell ill easily and the ______were full of people. They had problems with their noses and lungs.

So it's necessary ______ people from doing so many bad things to the environment. For example, people should use cars less and ______ burn lots of coal and gas. Government needs to take measures to make factories stop pouring ______waste air into the sky.

Three students from No.4 High School in Beijing ______ a report to advise how to protect the environment. They suggested ______ people should plant more trees and set off fewer fireworks for celebration.

We hope more people will join us in ______ a difference. In this way, the blue sky will certainly return for good.

1.A. in    B. from    C. for    D. at

2.A. that    B. /    C. who    D. whom

3.A. lucky    B. especial    C. especially    D. luckily

4.A. schools    B. gardens    C. zoos    D. hospitals

5.A. stop    B. stopping    C. to stop    D. stopped

6.A. needn't    B. shouldn't    C. should    D. can

7.A. too many    B. many too    C. too much    D. much too

8.A. wrote    B. write    C. are writing    D. will write

9.A. which    B. where    C. that    D. who

10.A. make    B. to make    C. made    D. making