单项选择题

When crossing a busy street，children should be very（）of the speeding cars.

A.ignorant
B.cautious
C.capable
D.Alert

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单项选择题
In （）to the government’s call，a great number of doctors and soldiers went to the frontline of fighting against the flood.

A.return
B.admission
C.response
D.order
单项选择题
（）such a job was sheer good luck.

A.Offering
B.Offered
C.Being offered
D.Being offering
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