练习题：

　　1、--- Guess what! I have got A for my term paper.
　　　　 --- Great! You ______ read widely and put a lot of work into it.
　　　 A. must B. should C. must have D. should have

　　2、-What do you think we can do for our aged parents？
　　　　 -You_________ do anything except to be with them and be yourself.
　　　　A. don't have to B. oughtn't to
　　　　C. mustn't D. can't

　　3、You know he is not going to let us leave early if we ___ get the work done.
　　　　A. can't B. may not C. shouldn't D. mustn't

　　4、There's no light on-they______ be at home.
　　　　A. can't B. mustn't C. needn't D. shouldn't

　　5、When I was young, I was told that I ______ play with matches
　　　　A. wouldn't B. needn't C. mustn't D. daren't

　　6、John promised his doctor he _____not smoke, and he has never smoked ever since.
　　　　A. might B. should C. could D. would

　　7、It is usually warm in my hometown in March, but it ________be rather cold sometimes.
　　　　A. must B. can C. should D. would

　　8、 You don't have to know the name of the author to find a book. You find the book by the title.
　　　　A. must B. need C. can D. would