I. 
2.G             3.E             4.F            5.A        6.D        7.C 

II.
2. dentist        3.painters        4.farmer         5.pianist        6.doctor       7.writers

III.
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

IV. 
1.the longest

II.

1.teacher

2.dentist

3.painters

4.farmer

5.pianist

6.doctor

7.journalists

III

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