单项选择题

Don't have the water ______ all the time while you are out.

A. running
B. run
C. runned

D. runs
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单项选择题
I like him because he makes me ______.
A. to laugh
B. laughed
C. laugh
D. laughing
单项选择题
Knock ______ the door before you enter the room.
A. on
B. for
C. at
D. in
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