The teeth are _____ , and my grandmother often takes them out to wash them and then put them back.
| A．magical | B．artificial |
| C．logical | D．official |
A computer _____ think for itself; it must be told what to do.
| A．can’t | B．wouldn’t | C．mustn’t | D．may not |
You _____ to eat if you don’t feel like it.
| A．needn’t | B．mustn’t | C．don’t have | D．haven’t |
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 |