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Checking your answers before handing in your paper can help you ________ mistakes.
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Looking after a baby is as _________ (挑战) as working on a new job, do you think so?
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At the meeting, we discussed___ we should spend more money on the project.
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___________ ,蜡炬成灰泪始干。(李商隐《无题》)
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已知平面内两点A(0,3),B(4,0),P到A,B两点之间的距离和为6,则P轨迹方程是
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