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第1题

She has been working so hard that she feels quite .
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第2题

Scientists are doing research on the way [_][_][_][_][_].
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第3题

He was at a loss what to do, but finally he [_][_][_][_][_] an answer.
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第4题

[_]the end of the exam [_] he had missed a question in the paper.
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