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
Tom always prefers _________on foot rather than _______ a bike.
A . walk; ride B. walk; riding C. to walk; ride D. riding; to ride
