单项选择题

When he bent down to tie his shoelace, the belt of his trousers ______.

A．ruined
B．cracked
C．broke
D．split
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单项选择题
Mary tiptoed over and took the clock away because she hated to hear it ______ when she was trying to go to sleep.
A．sounding
B．ringing
C．ticking
D．humming
单项选择题
Postal ______ are determined by the class and weight of the parcel mailed.
A．taxes
B．payment
C．fees
D．premium
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