11 must

12 may

13 won't

14 doesn't have to

15 used to

6 doesn't have to

7 can't

8 will

9 won't

10 mustn't

1 can

2 should

3 shouldn't

4 can

5 have to

12 My sister drinks less coffee than my brother does

13 I eat less chocolate than she does

14 There is more rice on the plate than there is in the bowl

10 There isn’t as much noise in the country as there is in the city

11 I have fewer storybooks than my sister does

12 I don’t have as many music CD’s as my friends do

7 The red car is more expensive than the black one

8 Trung is the tallest in the group

9 Is this the best refrigerator you have?

4 No one in her class is as intelligent as my sister

5 Jack’s brother is more intelligent than him/he is

6 Your house is smaller than my house

IV

1 Yesterday was colder than today

2 Quang Hai is the most skillful player in our football team

3 His house is the highest in my city

1 B

2 B

3 C

4 C

1 T

2 T

3 T

4 N

5 F