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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