1.It is one of the main reasons to protect environment.
2.We can try to do something difficult.
3.We can try our best.
4.Are you ready to do it?
8.The city here is not as clean as that one.
9.You dress up this modelling like a boy.用下列词组造句：1.one of the main reasons 2.try to do 3.try one's best 4.be ready to 8.not as