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—The cars give off a great deal of waste gas into the streets.

—Yes. But I’m sure something must be done to __________air pollution.

A. reduce　　  　　　　   B. remove　　  　　　　  C. collect　　  　　　　   D. increase

—Yes. But I’m sure something must be done to __________air pollution.

A. reduce　　  　　　　   B. remove　　  　　　　  C. collect　　  　　　　   D. increase

－The cars give off a great deal of waste gas into streets.

－Yes. But I'm sure something will be done to ________ air pollution.

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