If I ___ free tonight, I'll go to the cinema with you.
| A．am | B．was | C．will be | D．be |
How _____ you say that you really understand the whole story if you have covered only part of the article?
| A．can | B．must | C．need | D．may |
It has been announced that candidates _____ remain in their seats until all the papers have been collected.
| A．can | B．will | C．may | D．shall |
Parents must take good care of their children, _____ they?
| A．mustn’t | B．don’t | C．needn’t | D．aren’t |
He must be in the reading-room, _____ he?
| A．mustn’t | B．doesn’t | C．needn’t | D．isn’t |
It was 4:25 a.m. _____ the ambulance arrived to take the body of Miss Lee.
| A．when | B．until | C．that | D．since |