单项选择题

If you know ______ , you will have a job. If you know why, you will be the boss.

A．how
B．when
C．what
D．if
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单项选择题
He could hardly ______ his temper and he flew in a rage.
A．hold on
B．hold onto
C．hold up
D．hold in
单项选择题
When asked to ______ the age of the antique, you need to have a special knowledge of the history.
A．think
B．guess
C．tell
D．suppose
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