单项选择题

After years of ____________ bee dancing, the scientist found that the dances have certain patterns.

A．gazing
B．watching
C．observing
D．viewing
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单项选择题
The light bulb in the bathroom burned ____________ and Father put in a new one.
A．off
B．down
C．out
D．away
单项选择题
It is ____________ of him to get rid of his bad friends after entering high school.
A．sensible
B．sensitive
C．senseless
D．sensational
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