For the dinner, we usually pay tips around _______ of the bill.
A. 5%
B. 18%
C. 50%
D. 80%
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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.
He left a _____(tip) to the boy for mercy.