_________we all know, Americans are competitive.
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推荐题目
The worsening of global warming, _____human activities are to blame, has led to frequently extreme weather.
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by which
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At 13，Samuel received a training course in drawing for three years，________ he got a good opportunity for further development.
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When deeply absorbed in work, _____ he often was, he would forget all about eating or sleeping.
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The company was willing to provide us with what we needed, _____ made us excited.
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what
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________is often the case, the weather has turned out well as expected.
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