—We _______ keep quiet in the library.
—Yes, I agree with you. And we _________ bring our student cards every time.
| A．must； mustn’t | B．have to； mustn’t |
| C．must； don’t have to | D．have to； don’t have to |
―I’m sorry I’m late.
―_________. Come earlier next time.
| A．My pleasure | B．No problem |
| C．It doesn’t matter | D．All right |
________ painting it is! This is probably the ugliest one I’ve ever seen.
| A．How terrible | B．How good |
| C．What a terrible | D．What a good |
―Congratulations, Jane, you have won the first prize in the physics competition.
―Thank you, Mr Green. I can’t make such great __________ without your help.
| A．experience | B．experiment |
| C．progress | D．operation |
The water in the river nearby will be dirtier than before if nothing __________.
| A．has done | B．will be done |
| C．is done | D．was done |
―Is Tom coming to the concert this evening?
―No, he _________ be at the concert. He _______ abroad.
| A．mustn’t, has been | B．mustn’t, has been to |
| C．can’t, has gone to | D．can’t, has gone |