Ответ:

1) is cleaner

2) more industrialized than

3) the most attractive

4) is more modern

5) oldest

6) is more important than

7) the longest

8) better

9) are more intelligent than

10) the highest

11) best

12) is hotter than

13) is more expensive

14) is the worriest

15) the worst

16) is the most important