单项选择题

"Do you hear someone knocking at the door"
"Yes, I did. I heard him () three times."

A．knocking
B．knocked
C．being knocking
D．knock

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单项选择题
The two thieves fled the town separately, () a bag.

A．each carrying
B．whose that watch is
C．whose watch is that
D．whose watch is
单项选择题
A burning cigarette he threw into the wastepaper basket () fire to the hotel.

A．made
B．set
C．caused
D．caught
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