题目内容：

阅读下面材料，在空白处填入适当内容(1个单词)或括号内单词的正确形式。

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.(reason): 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.(beside) 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 the environment and does something to stop pollution, the problem will 10.(solve)．