_____ the government agrees to give extra money , the theatre will have to close.
A. Until B. Unless C. Since D. While
----I am sorry to have ____ too much of your time.
----That's OK, and I am glad to help you.
A. taken up B. taken on C. taken off D. taken in
Mary and her friends paid_____visit to _______Summer Palace yesterday.
A. the; / B.a; the C.a; / D. the; a
It was back home after the experiment.
A. not until midnight did he go B. until midnight that he didn’t go
C. not until midnight that he went D. until midnight when he didn’t go
is believed that improvement in health care will lead to a stronger , more prosperous economy .
A. As B. That C. This D. It
----May I smoke here ?
-----If you , choose a seat in the smoking section .
A. should B. could C. may D. must
