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I was doing my homework while my parents were ________ (cook)dinner.
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The mother didn't know___________ is to blame for the broken glass as it happened while she was out.
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I carried the bowl with both hands________, so that I wouldn’t break it. [ ]
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为人体血液循环过程中某物质含量的变化情况,如果Ⅰ代表肺泡间的毛细血管,Ⅲ代表组织细胞间的毛细血管,则该物质最可能是( )
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