Exercise 6:

1 A

2 C

3 A

4 C

5 B

6 A

7 D

8 A

Exercise 1:

1 D

2 B

3 D

Exercise 2:

1 D

2 A

3 C

Exercise 3:

1 D

2 C

3 B

4 D

5 C

6 A

7 D

8 C

Exercise 6:

1 B

2 D

3 B

4 D

5 B

6 D

7 A

8 A

9 C

10 A

V.

1. Nam said that he wanted to become a scientist when he grew up.

2. Peter said that they had met proffessor Stephen Marshall the day before.

3. Hoa said that she couldn't go to the science class the next morning.

4. She told us that they had dtudied that kind of plant for two months

5. Mr. Vinh said that the didn't open the laboratory that day.

6. Nick said that he was tinding evidence for his research then.

7. I told Mary that she might be late for the workshop that afternoon.

8. Dr. Thomas said that he hadn't taught Earth Science the previous year.

9. Minh told me that they would start collecting the data the next month.

10. Jane said that her sister wasn't leaving for London that night.

VII

1 C

2 A

3 D

4 B

5 B

6 D 

7 A

8 B

9 A