Chia dạng đúng của tính từ trong ngoặc

1.Lan is (clever)cleverer and (pretty) prettier than Lien
2.What is the (long)longest river in VN?
3.She's (nice)nicer than I expected
4The winter is coming.It's getting (cold)colder and (dry)drier
5.An ocean is (large)larger than a sea
6.A blue house is (big)bigger and (clean)cleaner than a red one
7.This exercise is (easy)easier than that one
8.This is (interesting)the most interesting film of all