Bai 17:

1, the most popular

2, more important

3, the shortest day

4, bigger than

5, more comfortable than

6, worse

7, more peaceful than

8, the most clever

9, the most delicious

10, the most boring

11, the most intelligent

12, the oldest

13, more uncomfortable

14, more important

15, more healthy

16, the most difficult

17, most expensive

18, faster

19, more interesting

20, earlier

Bai 18:

1, Gary is taller than Rick.

2, John has got new light treasures. (Câu này mình không nhìn rõ đề nên mình đoán thôi)

3, Mary likes bigger clothes.

4, Rick is wearing an expensive coat.

5, Câu này mình không nhìn được đề

6, He is the tallest student.

7, Mary was the most popular actress.

8, He was the best footballer.

9, Mary plays better than you.

10, Câu này mình không nhìn rõ đề.