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【答案】
【1】 go by
【2】 What do
【3】 Does go
【4】What makes the air dirty?
【5】We can walk to school.
【解析】
【1】此句意是:有时我们乘公共汽车去学校?与之意思相近的是Sometimes we go to school by bus.故填go; by.
【2】此句划线部分是put the clothes away, 所以提问时要用What, 应是What can you do to keep your room clean?
【3】此句改为一般疑问句时要借助于助动词does, 后面动词用原形。
【4】根据所给的词及标点可组成句子为What makes the air dirty?
【5】根据所给的词及标点可组成句子为We can walk to school.