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It ___________open. I had locked it myself and the key was in my pocket.
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She said that ______ (加入) the English club was the best way to improve your English.
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当你站在封冻的湖面上,突然发现脚下的冰面将要破裂,你应该采取的措施是( )
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Many people believe that 3G mobile phones will be used in almost all everyday activities.
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