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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单项选择题
In my country, the ______ are all distributed free.
A．letters box
B．letters boxes
C．letter’s box
D．letter boxes
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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