One of the professor's friends help him by taking care of his children for him.
A. Right.
B. Wrong.
C. Doesn't say.
The monkeys know how to wear the caps because ______.
A. they live in the wood
B. they like the caps very much
C. they copied from the man
【B9】
A. for
B. to
C. with
Jack sat down in front of the visitor because he wanted ______.
A. to see the visitor
B. to show the visitor how clever he is
C. the visitor to leave
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