---Look，what a mess in the kitchen！
---I ______cooking fish in a new way and I really have no time to tidy it up now.
| A．tried | B．had tried |
| C．will try | D．have been trying |
It took seven years __________ they finally got married.
| A．since | B．after | C．before | D．when |
The students asked me ____________ going to be held.
| A．when is the meeting | B．when the meeting was |
| C．if was the meeting | D．if the meeting is |
In the past month, cruel snowstorms hit some European countries and America ,great transportation problems in these countries.
| A．causing | B．caused | C．to cause | D．having caused |
______he has made up his mind, no one can make him change it.
| A．Although | B．Unless | C．Until | D．Once |
—I’m going to the United States.
—How long ______ you ______ in the United States?
| A．are; stayed | B．are; staying | C．have; stayed | D．did; stay |