2) the most relaxing

3) longer

4) the least

5) far ( здесь вроде как не нужны добавления)

6) more interesting

7) quieter

8) longer

9) better

10) more exciting

11) more comfortable

12) easier

13) the least frightening

14) cheaper

Ответ:

2. the most relaxing

3.longer

4. the least

5. farther

6. more interesting

7. quieter

8. longer

9. the best

10. more exciting

11. more comfortable

12.easier

13. the most frightening

14. cheaper