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
