Listen! Someone __________ at the door. I'll go to see who it is.
| A．has knocked |
| B．is knocking |
| C．are knocking |
| D．knocks |
She is looking forward to _____ president of the university.
A．electing (选举) the |
B．being elected | C．be elected | D．elect the |
After I had finished eating, I was advised ____ for the meeting.
| A．to set about preparing | B．setting out to prepare |
C．to set aside preparing | D．setting down . |
You ____ so hurriedly, there is much time left.
| A．shouldn’t come | B．mustn’t have come | C．can’t have come | D．needn’t have come |
--“ I wonder if you’d mind us asking a few questions.”--“ Not at all. ______.”
| A．You are welcome | B．Go right ahead. | C．Don’t mention it. | D．Take it easy. |
____ life will continue on the earth for millions of years to come will depend on _____ this problem can be solved.
| A．That; whether | B．If; how | C．Whether; whether | D．If; if |