4. His mother is unhappy because his room is untidy

5.Global warming happens because there is too much....

III. 1. Noise pollution causes a change in animals' living pattern

2.Radioactive pollution is very dangerous since it can cause abnormal growth

3.The chernobyl nuclear accident happened made the area unhabitable

4.Fossil fuels such as coal or oil are burnt so acid gases are produced

5.Trees leaves are damaged because of dangerous acid rain

6.The tree cannot get enough food energy to stay healthy because leaves are damaged

IV.1.B. were destroyed 2.D were having 3.B water pollution 4.D fine

II/

4/His mother is unhappy because his room is untidy

5/Global warming happens because there is too much...

III/

1/Noise pollution causes a change in animals' living pattern

2/Radioactive pollution is very dangerous since it can cause abnormal growth

3/The chernobyl nuclear accident happened made the area unhabitable

4/Fossil fuels such as coal or oil are burnt so acid gases are produced

5/Trees leaves are damaged because of dangerous acid rain

6/The tree cannot get enough food energy to stay healthy because leaves are damaged

IV/

1/B

2/D

3/B

4/D