____________-, we have learned a big lesson from the frustrating event.
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It is true that the hotel ____________ comfort with convenience.
About 50 people _________-up to help found the organization.
She has been waiting for John to break down the___________between them.
土壤污染治理大致可以分为（）等方法。
A. 物理
B. 化学
C. 生物
D. 合成
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