`29`. C every day

`=>` Dẫn chứng: dòng 1, 2. Every day on radio, on TV, and in the newsaper, we hear, see or read about many problems in the world.

`30`. D all are correct

`=>` Dẫn chứng: Dòng 4, 5. Air pollution mostly comes from fumes released from motorbikes, cars, airplanes, trains and poisonous gases emitted from factories.

`31`. A oil spills and factories wastes

`=>` Dẫn chứng: the sea has become so polluted from oil spills and factory wastes that the fish are dying.

`32`. A We should find a good solution.

`=>` Dẫn chứng: Dòng cuối. We must find a good solution that makes the world a better place to live.

29. C. Every day ("Every day on radio, on TV, and in the newspaper, we hear, see or read about many problems in the world,..."

30. D. All are correct ("...comes from fumes released from motorbikes, cars, airplanes, trains and poisonous gases....")

31. A. Oil spills and factory wastes ("...But the sea has become so polluted from oil spills and factory wastes...")

32. A. We should find a good solution ("...We must find a good solution that makes the world a better place to live.")

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