—Do I need to give a tip if I eat at a fast food restaurant in the United States? —Yes, it

—Do I need to give a tip if I eat at a fast food restaurant in the United States?
—Yes, it’s a common to tip waiter in a restaurant.
A. sense
B. custom
C. method
D. practice

A. senseB. customC. method(答案→)D. practice解析：这题考查名词搭配：common sense常识common practice惯例，根据句意：--我在快餐店吃饭需要给小费吗？--是的，在饭店吃饭给小费是惯例。选D。

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