单项选择题

We must ______ that the experiment is gong to be controlled as rigidly as possible.

A．assure
B．secure
C．ensure
D．endure
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单项选择题
That boy is such a good violinist that he will probably make quite a ______ for himself.
A．name
B．glory
C．fame
D．character
单项选择题
The firm's promise to increase our pay was a reluctant ______ to union demands, because the union would otherwise not go back to work.
A．response
B．reply
C．reaction
D．concession
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