单项选择题

In the west, people make______ a rule to send Christmas present to their relatives and friends.

A．this
B．that
C．it
D．the following
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单项选择题
He said that books on ______ popular science are in ______ short supply.
A．the; a
B．/; /
C．/; the
D．the; the
单项选择题
As it turned out to be a problem of no importance, we______ so much time looking into it.
A．needn't spend
B．didn't have to spend
C．oughtn't to spend
D．needn't have spent
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