Làm nhanh hộ mik cảm ơn nha >.<

EX3

1. were ____ went

2. didn't go ____ stayed ____ did

3. isn't working

4. Did you watch

5. haven't taken

EX4

1. I have just come back from Nha Trang in a vacation.

2. Quoc Tu Giam was the first university in Viet Nam.

3. There are six continents in the world.

4. It is the most famous tower in England.

5. The old buiding is more than 100 years, but it looks new.

EX5

1. carefully

2. beautiful

3. nationality

4. tallest

5. leaves

6. sunny

7. singer

8. teeth

9. Chinese

10. noisy

EX6

1, B 
2, A
3, D
4, A 
5, C