Ex 1:

1. The second question was more difficult than the first one. 

2. The brown coat is bigger than the black one.

3. The sofa is more comfortable than the chair.

4. Jack's suitcase is heavier than Jim's suitcase.

5. My homework is worse than his homework.

6. The small television is cheaper than the big one.

7. The Holton Hotel is more modern-fashioned than the Royal Hotel.

8. The weather today is better than it was yesterday.

9. People in the country are more friendly than people in the city. 

10. Life in the country is more boring than life in the city. 

Ex 2:

1. doesn't ride/ walks

2. will visit

3. Were you/ was

4. calls

5. will study

6. is coming

7. gets

8. stayed

9. will buy

10. has

11. is

12. is painting

Ex 3:

1. A

2. B

3. D

4. A

5. C

6. A

7. A

8. B

9. D

10. A

11. B

12. B

13. D

14. D

15. B