单项选择题

Entering the room, the head-master said, "Everyone ______ quiet, please."

A.keep
B.keeps
C.is keeping
D.to keep
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单项选择题
______ the road round to the right and you’ll find his house.
A.Follow
B.Following
C.To follow
D.Followed
单项选择题
—Hello, Zhu Hua. I’ll have to return to Canada because I’ve worked here for a year. — ______ !
A.What time flies
B.How time flies
C.What does time fly
D.How does time fly
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