单项选择题

Mike looks so sleepy in the class; he ______ up last night.

A．must stay
B．should have stayed
C．must have stayed
D．is sure to stay
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单项选择题
Hemingway's enduring contribution to the human being is his insistence that grace ______ under pressure.
A．is to be kept
B．has been kept
C．should have been kept
D．be kept
单项选择题
In his ______ to further his knowledge of the universe, man has now begun to explore space.
A．attempt
B．expedition
C．trial
D．chase
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