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
The day ______ I shall never forget is the one ______ I joined the army.
A．that… where
B．when… in which
C．which… when
D．on which… why
单项选择题
When you become frightened, many physical changes occur within your body.Your heartbeat and responses quicken; your pupils dilate (扩大) and ______ more light.
A．permit
B．allow
C．admit
D．let
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