单项选择题

Henry is waiting for you at your office. You'd better ______ there at once.

A. go
B. to go
C. going
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______ do their homework carefully.
A. No all the students
B. Not all the students
C. None the students
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He took a job in his spare time in order to ______ some experience.
A. win
B. gain
C. check
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