Direstions: use the follwing words to fill in the blanks.should, shouldn't, must, mustn't, have to, needn't
查看答案
Look at the sign, you __________ throw the litter around here.
If you want to be thinner, you _______ eat less meat.
You ________ watch too much TV. It's bad for your eyes.
I missed the bus. So I _____ take a taxi.