用should,shouldn’t,must,mustn’t,needn’t,can’t ,may,have to 填空．
1.―― I take the message for you right now?-- No,you needn’t.
2.Do we join the club today?
3.Look at the sign.You throw litter around here.
4.-- I ask you some questions,Dr.Li?--Sure,go ahead.
5.You finish the work tonight.You have enough time to do it.
6.They work out the problem by themselves.It’s too difficult.
7.If you want to be thinner,you eat less meat.
8.You watch too much TV.It’s bad for your eyes.