A.

I.

1. C      2. A         3. C

II. 

1. A     2. C          3. D

B.

I.

1. C

2. A

3. C

4. D

5. A

6. C

7. A

8. A 

II. 

1. will help      2. wasn't         3. watched - had done.

C. 

1. She felt unsafe.

2. She thought they might fall down.

3. She was busy with her assignments.

4. She didn't want to study.

5. Yes, she did.

D.

1. If there wasn't so much light in the city at night, we could see the stars clearly.

2. Rice is exported to many countries in the world by Vietnam.

3. Because the factories produce wastes into rivers and lakes, many of them are polluted. 

4. Rescue workers will be sent to the flooded villages.

5. Was Nghe An province hit by the storm?