III.

1.heavier

2.harder

3.brighter

4.more quickly

5.more happily

6.noisier

7.easier 

8.better

IV.

1. Nick writes essays more carefully than Phuc.

2. The snail moves more slowly than a crab.

3. My father explained the subject more clearly than my brother.

4. My cousin sings well than I do.

5. Phong swims faster than Phuc.

V.

1. more soundly                                        5. more generous

2. healthier                                                6. better

3. more traditional                                     7. more optimistic

4. more quickly                                          8. more badly

C. Structures and vocabulary

 I.

1. peaceful                                          6. friendly

2. Nomadic                                         7. healthier

3. collecting                                        8. traditional

4. inconvenience                                9. generously

5. safer                                               10. soundly