单项选择题

Our first and subsequent courses have been a success and are part of a long-term ______ to AIDS prevention.

A. pursuit
B. commitment
C. reaction
D. endeavor
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单项选择题
The boy was interviewed by two managers, neither of ______ very impressive, one nearsighted and the other crippled.
A. them
B. which
C. both
D. whom
单项选择题
He brings with him a wealth of experience and for our part, we ______ him of our loyal support.
A. ensure
B. assure
C. reassure
D. guarantee
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