1. grayer
2,fattest
3 heavier and heavier
4 tallest
5 attentivest (most attentive)???
6 colder, yellower
7 most beautiful
8 better
9 lighter
10 drier
11 faster
12 nice nicer
13 angrier and angrier
14 harder And harder
15 tallest
16 more carefull
17 quite quiter