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_____ lunch, the committee members discussed the problem（）
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_____ hundreds of pieces of litter（）
Now I’d like you to spend five minutes talking about the topic: What _____ you do if you _____ President（）
Though my aunt pursued what was, in those days, an enlightened policy _____ she never allowed her domestic staff to work more than eight hours a day, she was extremely difficult to please（）
Complicated _____ it is, the problem can be solved in only two hours with an electronic computer（）
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