1 . Water had also appeared on other planets like Mars but, ________ (不像) the earth, it had disappeared later. (根据汉语提示单词拼写)
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2 . Some people volunteer to help people __________ (在困难中). (根据汉语提示完成句子)
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3 . Why did you_____ (投票)against Mr Smith at the meeting? (根据汉语提示单词拼写)
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