题目内容
Only by keeping down costs will America ______ its competitive advantage over other countries.
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People there are told it is their ________ duty to support the national economy by buying their own products.
His success came from ________ rather than opportunity .
I want to ______ my partners for the very important commitments that they made to the project.
The ship ________ from the agreed voyage and arrived half a month late.
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