V.

1. will have = > Has

2. because = > so

3. or = > and

4. love = > like

5. and = > or

6. however = > so

7. so = > because

8. and = > but

9. So = > but

VI.

1. We cannot swim in this part of the river because the water is highly polluted.

2. The company does not produce recycle paper because it is more expensive to produce them regular paper.

3. We want people to be aware of the problem of pollution as we have "a green week" three times a year.

4. No one wants to go swimming or sunbathing there because the area around the beach is full of trash.

5. We could not keep on cleaning the beach since it started to rain.

6. Mr. Minh is admired as he dedicates all his life to protecting the environment.

V. In each the following sentences, four words or phrases have been underlined. Choose the one word or phrase that would not be appropriate

1. will have → has

2. because → so

3. or → and

4. and → so

5. and → or

6. however → so

7. so → because

8. and → but

9. so → but

VI. Combine these pairs of sentences. Use because, since or as.

1, We cannot swim in this part of the river because the river is highly polluted

2, The company does not produce recycled paper since it is more expensive to produce them regular paper.

3, We have " a green week" three times a year since we want people to be aware of the problem of the pollution.

4. No one wants to go swimming or sunbathing because the area around the beach is full of trash.

5. We could not keep on cleaning the beach as it started to rain.

6. Mr. Minh is admired because he dedicates all his life to protecting the environment.