18. by

19. of

What did the pythons do when you were there

1/ was sitting, saw 
2/ was going, shined
3/ went, was having
4/ rained, carried
5/ were walking, began 

-3

B

C

B

 C

 D

1. A

2. C

3. B

4. B

5. D

6. C

7. A

8. D

9. A

10. B

1. farmer

2. housework

6.B->of buying

8.B->talked

1. I'd rather you didn't smoke in here.

2. If the patient hadn't received his treatment, he would have died.

3. He was so tired that she fell asleep before the end of the film.

4.  No one in the club play tennes better than Janet.

5. It is a four-hour train journey from Nha Trang to HCM city.