1the longest
2the coldest
3new
4more beautiful
5the best
6longer
7colder
8more difficult
9stronger
10better
11the warmer,the better
12much more serious
13easier
14twice as expensive as
15much more
16the latest
17elder.older
18more exciting
19the most modern
20taller
21smaller,less
22more useful
23the farthest
24the most reliable
25worse