1.Mobile phones make it possible for us to talk to other people no matter where we are.
2.Fresh air is necessary for health.
3.Please tell me how to prevent this kind of things to happen.
4.Besides giving me advice,he also give me money.
5.He doesn't know how to reply this letter.
6.Finally,the saved ninty percent of the trees in this forest.
7.Now,it's my turn to learn how to get along with others.