单项选择题

The authorities spend a lot of money ______ keeping the streets and parks clean.

A．in
B．on
C．up
D．out
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单项选择题
It is required that such insulator (绝热体) ______ a heat resistant material.
A．must be made of
B．should be made of
C．will be made of
D．would be made of
单项选择题
He looked through the pages of advertisements to find jobs ______ to college students during the summer holidays.
A．obtainable
B．available
C．convenient
D．essential
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