单项选择题

In both America and Europe,it is _____to tip the waiter or waitress anywhere from 10% to 20%.

A．elementary
B．temporary
C．voluntary
D．customary
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单项选择题
Such an approach forces managers to communicate with one another and helps （） rigid departmental borndaries.

A．pass over
B．stand for
C．break down
D．set off
单项选择题
The development of staff cohesion and a sense of team effort in the workplace can be effectively _______by the use of humor.
A．acquainted
B．installed
C．regulated
D．facilitated
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