2. A

3. The

4. A

5. The

6. The

7. The

8. A

9. A

10. The

11. The

12. The

13. X

14. The

15. A

16. The/the/ an

19. The

20. The 

21 x

II.

1.longer than

2. More painful than

3. Older than

4. More simple than

5. More fluently than

6. More important than

7. Cheaper than

8. Healthier and more peaceful than

III.

1. The funniest story i’ve ever heard

2. The worst mistake he has ever made

3. The biggest meal i’ve ever had

4. The most gorgeous person i’ve ever met

7. Are the best friend i’ve ever had

8. The most difficult decision i’ve ever had

IV.

2. Is the most famous singer in

3. Is the most popular sport in your country

4. What is the most expensive thing you’ve ever bought

6. What is the most stupid thing tou’ve ever done

7. Who is the most intelligent

8 eho is the most beautiful