Candidates ______ remain in their seats until all the papers have been collected.
| A．must | B．shall | C．may | D．can |
We used to have a discussion, ___?
| A．did you | B．didn’t we | C．used we | D．didn't used we |
I don't think you have eaten so many crisps ,____?
| A．do I | B．haven't you | C．have you | D．don't you |
A Kangaroo scarecely knew anything about it, __?
| A．didn't we | B．doesn't he | C．did he | D．does he |
We have to camp near, ___?
| A．don't we | B．haven't we | C．will we | D．needn’t we |
He must have admired what you did yesterday, ___?
| A．hasn't he | B．didn't he | C．must he | D．haven't he |