III.

Nouns : vegetables, party, family, dress, apartment, dinner, tub

Adjectives : cheap, expensive, high, lovely, awful, good, interesting, big, suitable

V.

1. the longest

2. the most interesting book

3. the biggest 

4. the best

5. the most beautiful house

6. the coldest

7. the fastest

8. the most important

IV.

1. more expensive than

2. faster than

3. more modern than

4. hotter than

5. more beautiful than

6. cheaper than

7. better than

8. more convenient than

VI.

(1). many

(2). and

(3). people's

(4). too

(5). near

(6). elder

(7). grade

(8). what

1. His father is a dentist. 

2. He works in a hospital.

3. His mother is a teacher.

4. She teaches in a school near her family house.

5. Ngoc is a painter and Nga is a student in grade 4.

6. Nam is older than Ngoc.

7. It's Ngoc.

8. Yes, he does.