单项选择题

Although most universities in the United States are on a semester system which offers classes in the fall and spring, some schools ______ a quarter system comprised of fall, winter, and summer quarters.

A．manipulate
B．stipulate
C．regulate
D．observe
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Usually he managed to find plenty of work to ______ him over hard times, I think it is a good ide
A．A. chewB. blowC. flipD. tide
单项选择题
She ______ for a while and was unable to make a decision, so she asked for my help.
A．flickered
B．glittered
C．faltered
D．blinked
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