单项选择题

Although the hazards of space travel are many, tile rewards made it a worthwhile ______.

A．endeavor
B．execution
C．expenditure
D．expedition
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单项选择题
The committee did their best to ______ the situation, but the damage was already done.
A．certify
B．exemplify
C．justify
D．rectify
单项选择题
Mike felt that students ______ to these tactics when they see no other way to address the problem.
A．proceed
B．appeal
C．resort
D．incline
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