Bài 1:

1. C

2.D

3.C

4.A

5. K biết

Bài 2:

1._Older than

2._More easy than

3._The tallest

4. fater than

5.  The most comfortable

6.The largest

7.The longest

8. More popular than

9.Better than

10.larger than

11. the most beautiful

12. the most talkative

13. the most interesting

14.the most homorous

Bài 2:

1. Mai is as  good as singer in our class

2.Guitars aren't as exepensive as many other instruments

3.I play the piano as good as than I play the vionlin

4.Tradintional pianos are as suitable as than keyboards for beginners

5.The guitar is the one of the most popular instruments among young people

Bài 3:

1b  2a 3c 4c 5c

6 not as old as 

7 easier than

8 the tallest

9 the most comfortable 

10 the largest

11 the longest

12 more popular than

13 better than 

14 larger than

15 the most beatiful

16 the most talhative

17 the most interesting

18 the most homorous

19 the best

20 as expensive  as

21 easy

22 better

23 heavier

24 more suitable

25 the most popular