chose the right forms to complete the sentence.1) roy is

chose the right forms to complete the sentence.
1) roy is ... than his brother jack.
a) young b) younger c) the youngest
2) winters in moskow now are ... than twenty years ago.
a) warm b) warmer c) the warmest
3) horses are ... than cars
a) slow b) slower c) the slowest
4) is this book ... in they library?
a)old b) older c)the oldest
5) green hill is not very ...
a) high b) higher c) the highest
6) jack"s bike is ... . it is jack"s birthday present.
a) new b) newer c) the newest
7) is the elephant ... animal?
a) strong b)stronger c) the strongest
8) sarah! your hands are ... than your brother"s hands!
a) dirty b) dirtier c) the dirtiest