单项选择题

Since our knowledge is （）, none of us can exclude the possibility of being wrong.

A. delicate
B. restrained
C. controlled
D. finite

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单项选择题

They decided to leave a big（）to the waiter because the food and service had been excellent.

A. fee
B. tip
C. prize
D. reward

单项选择题

I managed to talk down the price and bought the coat （）the discount of 20 percent.

A. for
B. with
C. on
D. at

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