单项选择题

(Passengers) (are warned) not to (get off) a bus while (moving).

A. Passengers
B. are warned
C. get off
D. moving
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单项选择题
I (remember) clearly (to return) the book to him last Wednesday, but now he (says) that (I didn' t).
A. remember
B. return
C. says
D. I didn't
单项选择题
How (can) you do such (thing) (without) (permission)
A. can
B. thing
C. without
D. permission
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