44.The massage is about many problems in the world. (Câu đầu của bài)

45.I hear, see or read about pollution problems every day. (Câu đầu của bài)

46.Fumes released from motorbikes, cars, airplanes, trains and poisonous gases emitted from factories caused the air pollution. (Câu hai của đoạn)

47.No, it isn't. (Còn có cả ô nhiễm biển nữa)

II. Read the passage, then answer the questions below.

44. What is the message about?

-> The massage is about many problems in the world. 

45. How often do you hear, see or read about pollution problems?

-> I hear, see or read about pollution problems every day.

46. What has caused the air pollution?

-> Fumes released from motorbikes, cars, airplanes, trains and poisonous gases emitted from factories caused the air pollution.

47. Is air pollution the first kind of pollution problems?

-> No, it isn't.  

I. Rewrite the following sentences in such a way that they mean exactly the same as the sentences given.

48. Study hard or you will fail in the next exams.

-> If you study hard, you won't fail the next exams.

Chúc bạn học tốt. ^_^