1.You should give up smoking.
2.Tom is ill,so you will attend the meeting instead of him.
3.My uncle has been sent to the old people's home.
4.What if there are no plants on the earth?
5.This weekend we have plenty of homework to do.
6.He came up with a good suggestion at the meeting.
7.I have used up all my money.
8.The coat you bought yesterday suits you fine.
剩下的不太确定啦,等其他高手给你解答吧!