CHO MK CAU TRA LOI HAY NHAT NHE

16.D

17.B

18.A

19.B

20.D

V.

1.was able to

2.could

3.were able to

4.couldn't 

5.been able to

VI.

1. A girl fell into the river but fortunately we ……were able to…… rescue her.

2. I …could…… walk when I was less than a year old.

3. My grandfather …was able to… walk without any help last night.

4. …Could… you understand what he was saying?

5. My grandmother ……was able to… speak Spanish.

6. Suddenly all the lights went out. We ........couldn’t……see a thing.

7. The computer went wrong, but luckily Emma ……was able to……put it right again.

8. There was a big party last night. You ……could…… hear the music half a mile away.

9. I learnt to read music as a child. I ……could/was able to…… read it when I was five.
10. People heard warnings about the food, and they …were able to… move out in time.

11. She wasn’t at home when I phoned but I …was able to contact …contact her at her office.

12. Mrs .Carter …was able to……put out the fire before the house burnt down.

13. I looked everywhere for the books, but I ……couldn’t…… find it.

14. The plane …was able to……take off at eleven o'clock ,after the fog had lifted.

15. It was foggy, so the plane …conldn’t/ was able to… take off.

II.

1. most

2. and

3. is

4. is

5. snow

6. of

7. winter

8. listen

9. on

10. in