It was____the old worker came that we____the experiment.
| A．until;didn’t begin | B．not until;began |
| C．until;began | D．not until;didn’tbegin |
–Did Ken take the job in the bookstore?
–No, but I think he _____.
| A．will have | B．may have | C．should have | D．must have |
He _____ more than thirty.
| A．mustn’t be | B．shouldn’t be | C．won’t be | D．can’t be |
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 |