单项选择题

In road rules the red light is a （） for traffic to stop.

A. sign
B. sight
C. site
D. size

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单项选择题

When he entered the room he found a cat （） quietly under the desk.

A. lie
B. lies
C. to lie
D. lying

单项选择题

First of all, a teacher should show love for his students on top of his academic knowledge. （）, he is not qualified for his position.

A. Therefore
B. Otherwise
C. However
D. Because

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