题目内容

具有定位功能的螺纹连接是。

A. 普通螺栓
B. 铰制孔螺栓
C. 紧定螺钉
D. 双头螺柱

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For the dinner, we usually pay tips around _______ of the bill.

A. 5%
B. 18%
C. 50%
D. 80%

John _______ to waiters every time he is satisfied with the service.

A. tip
B. tips
C. tipping
D. tippd

We paied 20 dollars as the _____(tip) to the waiter.

_____(tip) is a common culture in North America.