Bài 1

1.better

2.happiest

3.faster

4.more colourfull

5.better

6.good

7.least

8. prettier

9. the best

10.the sicker

Bài 2:

1. as pretty

2. more expensive

3. more important

4. best

5. happier

6. most international

7. stronger

8.

8. more comfortable

9. better

10. the most delightful

11. the most careful

12. more interesting

13. more precious

14. warmer

15. good

16. more pleasant

17. the highest

18. stronger

19. fatter

20. the largest

Bài 3:

1.It is colder today than it was yesterday.

2. It takes longer by train than by car. 

3. We have never been busier at work than today before.

4. Jane's sister doesn't cook as well as her.

5.No one in this team can play better than Tom.