2 more

3 more

4 longer

5 smarter

6 less

7 better

9 the tallest student

10 bigger

11 better

12 the coldest

Bài 2

1.show

2.are going

3.needs

4.buy

5.mailed

6.phones

7 send

8 visit

9 play

Bài 3

mình không hiểu lắm :D

Bài 4

1 happier than

2 bạn cần để từ để mình làm  :0 mong bạn sửa 

$2. more$

$3. more$

$4. longer$

$5. smarter$

$6. less$

$7. better$

$9. the$ $tallest$ $student$

$10. bigger$

$11. better$

$12. the$ $coldest$

$2/$

$1.show$

$2.are$ $going$

$3.needs$

$4.buy$

$5.mailed$

$6.phones$

$7. send$

$8. visit$

$9. play$