题目内容

The flu is believed ____ by viruses that like to reproduce in the cells inside the human nose and throat．

A. cause
B. caused
C. to be caused
D. to have caused

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The young man hurried to the restaurant，only ____ the pork had been sold out．

A. telling
B. to tell
C. being told
D. to be told

____ by the beauty of nature，the old man from Taiwan decided to stay here for another two days．

Attracting
B. To attract
C. Attracted
D. Having been attracted

On seeing the young child ____ into the river,the passer-by sprang to his feet and went to rescue．

A. feel
B. fall
C. falling
D. to fall

Go on ____ the other exercise after you have finished your homework．

A. to do
B. doing
C. done
D. does