11.more interesting
12.heavier
14.the shortest
13.longger
15.stronger than

1.the largest.
2.the noisiest
3.stronger
4.the best
5.worse
6.the most famous
7.the highest
8.prettier
9.nicer
10.more difficult
11.more interesting
12.heavier
13.longer
14.the shortest
15.stronger than
16.bigger than
17.more beautiful than
18.more expensive than
19.heavier
20.better
21.more clever than