题目内容
At the meeting, he ____three important elements, namely, trade, human resources, and capital investment.
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When children ____difficulties on their own, they develop new skills and a strong belief in their abilities.
A friend of mine has decided to give up his well-paid job because the position is too ____and he has no time for his family.
It takes a(n) ____amount of time and energy to achieve proficiency (精通) in a foreign language.
交易成本就是在一定的社会关系中的关系成本（）。
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