单项选择题

Bats (are able) to (guide them) by producing sound waves (too high) for us (to hear).

A．are able
B．guide them
C．too high
D．to hear
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单项选择题
A (red-hair boy is (needed) to play (the part of) Hamlet in (this) new play.
A．red-hair
B．needed
C．the part of
D．this
单项选择题
I can't help (to think) it (would be) fun (to play) such (an exciting) game with them.
A．to think
B．would be
C．to play
D．an exciting
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