单项选择题

The drowning boy made a （） attempt to catch the rope thrown to him.

A．dangerous
B．graceful
C．gentle
D．desperate

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单项选择题
I can （） you that the animals are well cared for in our zoo, so you needn't worry about them.

A．suppose
B．assume
C．assure
D．grant
单项选择题
I'm very grateful for your help and hope to do something for you （） in the future.

A．in exchange
B．instead
C．in return
D．in particular
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