With prices _____ so much, it's hard for the company to plan a budget.
| A．fluctuating | B．waving | C．swinging | D．vibrating |
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 |
Tom always prefers _________on foot rather than _______ a bike.
| A．walk; ride | B．walk; riding | C．to walk; ride | D．riding; to ride |