单项选择题

Sam assured his boss that he would______ all his energies in doing this new job.

A．call forth
B．call at
C．call on
D．call off
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单项选择题
He's done stupid things before, but to look for the escaping gas with a match really was the______ silliness.
A．ultimate
B．unanimous
C．triumphant
D．trivial
单项选择题
The United Nations Conference on Drug Abuse, which took place earlier this year in Vienna, was a very______ meeting.
A．compulsory
B．profound
C．productive
D．extravagant
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