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【答案】Rubbish makes the streets messy and dirty. What makes our city dirty？Smoke from factories makes the air dirty. What can we do to keep our city clean？We can move some factories away from our city.
【解析】
1. 垃圾"rubbish", 使......脏乱差"make ... messy and dirty "。主语是第三人称单数，动词用单三式，make变成makes，故答案为: Rubbish makes the streets messy and dirty.
2. 什么"what", 我们城市"our city" 使......脏"make ...dirty"。疑问句中What做主语，视作第三人称单数，动词用单三式，makes，故答案为:What makes our city dirty？
3. 来自from, 工厂"factories" ，黑烟"smoke", 使......脏"make ...dirty"，空气“air”，主语是smoke，一般现在时中主语是第三人称单数，动词用单三式，makes，故答案为: Smoke from factories makes the air dirty.
4. 为了，此处表示目的，用to do，什么"what"， 保持.....干净是"keep ......clean"，我们城市是our city，我们能做“we can do”，疑问句中，what放在句首，后接一般疑问句，can提前，后接we do，变成what can we do，后接to keep our city clean，最后加问号，故答案为: What can we do to keep our city clean？
5. 我们"we", 将......搬离“move......away from"，一些工厂“some factories”我们的城市"our city"。故答案为: We can move some factories away from our city.
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