单项选择题

He worked ______ at his task for weeks before he felt satisfied that the results would justify his long effort.

A．occasionally
B．regularly
C．patiently
D．assiduously
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单项选择题
We need more men of culture and enlightment because we have too many ______ among US.
A．students
B．laymen
C．pragmatists
D．philosophers
单项选择题
His ______ remarks are often embarrassing because of their frankness.
A．sarcastic
B．urbane
C．ingenuous
D．sadistic
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