单项选择题

Psychologists agree that human beings have a strong need to ______ their time; having too much idle time can be as stressful as having none at all.

A．threaten
B．annihilate
C．structure
D．punctuate
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单项选择题
The conversation was so interesting that we were ______ of the lateness of the hour.
A．generous
B．credulous
C．gorgeous
D．oblivious
单项选择题
During their first teacher-training year, the students often visited local schools for the ______ of lessons.
A．investigation
B．observation
C．inspection
D．examination
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