单项选择题

It has been decided that all the students ______ stay in the classrooms even on Saturday evenings in case they go to Internet bars.

A. must
B. can
C. need
D. shall
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单项选择题
He had already walked three or four miles ______ he saw a cart, half-full of hay, by the side of the road.
A. while
B. when
C. the moment
D. unless
单项选择题
______ after a day's work, Mr. Brown got into bed and fell fast asleep.
A. Exhausted
B. Exhaust
C. Exhausting
D. To exhaust
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