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答案 1.each [each other相互代词。] 2.one [替代词的用法。one指代前面出现的那类事物中的“一个”，其复数形式为ones。] 3.mine [名词性物主代词作宾语。] 4.none [none＝not any表示全部否定。可构成none of...结构。] 5.it [it作形式宾语或主语，也可以指代前面出现过的同一个人或物。] 6.all [all指三者或三者以上，与not连用时，表示“部分否定”。] 7.Nothing [复合不定代词。] 8.himself [反身代词。] 9.another [可单独使用，也可修饰名词。] 10.that [可以指代前面出现过的不可数名词或单数可数名词(相当于the one)。] Ⅲ.正反探究 1.【误】 To save class time，our teacher has our students do half of the exercise in class and complete the other half for our homework. 【正】To save class time，our teacher has us students do half of the exercise in class and complete the other half for our homework. 解析 根据our teacher可知说话人是学生，us与students是同位语。has是动词，后需要跟宾语，故用us。 2.【误】The protection of our environment is not anything to be left to the government.Everyone should be concerned. 【正】 The protection of our environment is not something to be left to the government.Everyone should be concerned. 解析 something 在此处表示“某事，某物”，即环境保护的事情不能全部留给政府。 | 
