单项选择题

As far as the professor ______, college students should get into the habit of studying by themselves.

A．concern
B．concerns
C．concerned
D．is concerned
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单项选择题
Ryan was late for the conference yesterday ______ the traffic jam.
A．because
B．since
C．for
D．because of
单项选择题
In my bedroom, there is a pair of scissors, a stack of books and ______ flowers on my desk.
A．a piece of
B．a pocket of
C．a slice of
D．a bunch of
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