单项选择题

In some countries, attendance in the public schools is______ until age sixteen.

A．complimentary
B．compulsory
C．complementary
D．customary
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单项选择题
Knowing that the slightest mistake meant losing his job, the waiter carried the expensive glasses______ from the kitchen.
A．cautiously
B．gravely
C．profoundly
D．radically
单项选择题
The color of blue is the______ of calmness ,just contrary to the color of red.
A．token
B．representation
C．tone
D．expression
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