I.

2. A

3. B

4. C

5. B

II

2. Faster

3. More modern

4. Hotter

5. More beautiful

6. Cheper

7. Better

8. More convenient

9. The longest

10. The most interesting

11. The biggest

12. The best

13. The most beautiful

14. The coldest

15. The fastest

III.

1. Will they come

2. Will you get

3. Will tou do

4. Will do

5. Will call

6. She will get

7. Will recover

8. Will the weather be

9. Will return

10. Will you show

IV.

1. Shouldn't

2. Should

3. Should

4. Must

5. Must

6. Must

7. Mustn't 

II

2.faster than

3.more modern than

4.hotter than

5.more beautiful than

6.cheaper than

7.the best 

8.more convenient than

9.the longest

10.the most interesting

11.the biggest

12.the best

13.the most beautiful

14.the coldest

15.the fastest

III

1. will they come

2. will you get

3. will tou do

4. will do

5. will call

6. she will get

7. will recover

8. will the weather be

9. will return

10. will you show

IV.

1. shouldn't

2. should

3. should

4. must

5. must

6. must

7. mustn't