I- Complete the sentences with the correct verb form in the bracket

1, has been

2, watching

3, playing

4, Have you ever read

5, was built

6, built

7, not to make

8, repairing

9, come

10, isn't shining

11, walking

Giải thích : be used to + V-ing : quen với

12, to wait

13, going

14, didn't know

15, taking

II- Complete the sentences, using the correct form of the words in bracket

1. contaminated (bị ô nhiễm )

2. industrial

3. death

4. polluted

5. pollution

6, difficulty

7, polluted

8, unable

9, environmental

10, Natural

11, harmful

12, contaminated

13, illustration

14, poisonous

III- Read the following passage and then answer the questions below it

1, Air pollution is a cause of ill-health in human being

2, Smokes can be produced by factories

3, Yes, it can

4, The gases from the exhausts of cars, the lead in petrol can cause air pollution in cities

5, Because the gases in the atmosphere continue to increase

IV- Rewrite each sentence, beginning as shown

1, I wouldn't have got wet if I had had an umbrella

2, Unless you leave me alone, I will call the police