2.more expensive, most expensive
3.stronger ,strongest
4.more difficult,most difficult.
5.more intelligent,most intelligent
6.closer,closest
7.more popular,Most popular
8.safer,safest
9.more Important,most important.
10.louder,loudest.
11.weaker,weakest
12.tastier,tastiest.
13.more comfortable,most comfortable.
14.more delicious,most delicious