单项选择题

Security measures are ______ enforced on the premises.

A. suddenly
B. slightly
C. strictly
D. safely
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单项选择题
Students must sign up for classes this week in order to avoid ______ late fees.
A. paid
B. pay
C. to pay
D. paying
单项选择题
Before ______ home, commuters are advised to check traffic conditions.
A. leave
B. to leave
C. leaving
D. left
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