Ответ:

1)younger

2)the slowest

3)the most beautiful

4)more important

5)the best

6)more different

7)the longest

8)easier

9)more expensive

10)the coldest

11)more beatifulĺ

12)the newest

13)larger

14)the fastest

15)cleverer

16)worse

17)more useful

18)the hottest

19)taller

20)the highest