1c

2a 

How much are there two dozen eggs? 

If you study hard, you will be a good doctor

19. B 

20. C

21. B

Lan Anh is very  hard in learning

1. He likes watching TV.

2. Long is shorter than Hoa.

3. If we use recycle paper, we will save a lot of trees.

4. We have learnt English for 3 years.