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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Have you ever seen a () bag on the table7

A. plastic small black
B. black small plastic
C. plastic black small
D. small black plastic
单项选择题
However much (), it will be worth the price.

A. does the watch cost
B. costs the watch
C. the watch will cost
D. the watch costs
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