The boy said he had to speak English in class, but he ________ speak it after class.

A. could

B. didn't have to

C. might

D. shouldn't

You'd better go and ask Mr Yang. He ________know how to search the Internet.

A. can

B. would

C. may

D. could

Even the top students in our class can't work out this problem. So it ________be very difficult.

A. may

B. must

C. can

D. need

?Who is the man over there? Is it Mr Li?

?No, it ________be him. Mr Li is much taller.

A. mustn't

B. may not

C. can't

D. needn't

?Can you go swimming with us this afternoon?

?Sorry, I can't. I ________ take care of my little sister at home because my mother is ill.

A. can

B. may

C. would

D. have to

?May I go to play football now, Mum?

?OK. But you ________be back before 5 o'clock.

A. can

B. must

C. may

D. need

?May I take this book out of the reading room?

?________. Please read it here.

A. Certainly

B. No, you needn't

C. No, you mustn't

D. No, you may not

?Will you go shopping together with us this Sunday, Jenny?

?Yes, ________.

A. I do

B. I'd like to

C. I'd love to do

D. I'm busy

?Shall I bring you the book?

?No, you ________. I have read it already.

A. wouldn't

B. shouldn't

C. mustn't

D. needn't

?I was told to be here before eight.　　

?Oh, you ________. I'm sorry for not telling you that we have changed the plan.

A. must

B. can't

C. may

D. needn't