There are a lot of disadvantages of living in a big city, air pollution is among (30) ____________ most serious problems. Firstly, air pollution comes from the factories in the city. Big cities attract a lot of both inside and outside investments, (31) ____________ the number of factories is increasing quickly. This makes the air extremely (32) ____________ by smoke from factories. Secondly, that there are too many means also makes this problem worse. Exhaust from cars, motorbikes is one of the factors (33) ____________ make the air polluted. To conclude, air pollution, which expects to make more and more people get many serious (34) ____________ such as lung cancer, tuberculosis and so on, is a big drawback of city life.

30. A. a                 B. an                        C. the                        D. x

31. A. therefore        B. however                C. so                        D. but

32. A. pollutants        B. pollute                C. pollution                D. polluted

33. A. that                B. where                C. who                        D. when

34. A. happiness        B. diseases                C. benefits                D. accidents

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