单项选择题

Will you tell me which key is the one ______ the mailbox

A．of
B．to
C．for
D．on

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单项选择题

What has troubled many families in the United States（）

A．A not-large-enough income.
B．Nothing is left over to put away.
C．The increasing cost of living.
D．A shortage of certain goods.

单项选择题

Why does the cost of living keep increasing（）

A．Because are always shortages of goods.
B．Because the workers are getting lower and lower pay.
C．Because the government makes no interference.
D．Because people demand more and better goods.