语法填空练习一 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._______ these, about 10%of air pollution is cause∵d 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).