Who does the work at the end？
A. Nobody
B. Somebody
C. Everybody
The three professors didn't see the train, because ______
A. They were deep in the water
B. They were wearing glasses, and couldn't see clearly
C. They were deep in talking
The student thought it was not too bad because ______.
A. he didn't like the two professors who got on the train
B. he didn't want to see his professor's leaving
C. two of them got on the train
Finally the dog realized the dog in the water was actually his own reflection.
A. 真
B. False
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