题目内容：

阅读下面短文,按照句子结构的语法性和上下文连贯的要求,要求在空格处填入一个适当的词或使用括号中词语的正确形式填空

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 10.____________ (solve).