单项选择题

The post office says the stamp is useless when ______.

A．you buy it
B．you write a letter
C．put a letter into a postbox
D．it has a postmark on it
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单项选择题
When some of the stamps are difficult to find, ______
A．nobody will try to get them
B．they can become very valuable
C．everybody would like to buy them
D．they will be worthless
单项选择题
When you post a letter, you must buy ______.
A．a ten - fen stamp
B．a new stamp
C．a twenty - fen stamp
D．a stamp worth 10 fen or more
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