With the ________ (develop) of industry, air pollution _______ (get) more and more serious. In Beijing, many people suffer different kinds of illnesses as a result of air pollution.
Air pollution is caused by the following__________: about half of the problem is caused by transportation. There are more and more cars, buses on the roads, and they give off _________ (harm) gases. 25% of air pollution is caused by factories. Another factor is the smokers. Smoking not only does harm to their health _________ to others. _________ these, about 10% of air pollution is caused by other reasons.
We should take some measures to fight ________ pollution. New fuel can be used to take ________ place of gas. We can plant more trees.__________ everybody realizes the importance of environment and does something to stop pollution, the problem will ________ (solve).