题目内容
The spending cuts made it possible to fill the posts left _______by retired teachers.
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Can you list a few problems likely to ________the human race in the next few decades
More than $ 10 million in research costs has been lost a(an) _______nuclear safety problem.
They will give presentations on those aspects of engineering that are having an _______on the development of military equipment.
They provide information on methods to improve the __________ of training program for older workers, including helping older workers to find protective employment.
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