根据句意和汉语注释，在空格内写出单词的正确形式
【小题1】There is more pollution (污染) in our city now than before.
【小题2】The Summer Palace is a beautiful and quiet (安静的) place.
【小题3】Now many new teachers go to teach children in the north-west (西北方) of China.
【小题4】It is polite of us to give our seats to pollution （患病的）people on the bus.
【小题5】When we go on a school trip, we’d better wear sick (舒适的)clothes.
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解析：
【小题1】考查比较级。more后加名词，pollution“污染”，不可数。故填pollution。
【小题2】考查形容词。and连接的是两个形容词，quiet“安静的”。故填quiet。
【小题3】考查方位名词。north-west“西北”，故填north-west。
【小题4】考查形容词。sick“生病的”，作定语，故填sick。
【小题5】考查形容词。fortable“舒适的”，作定语修饰clothes。故填fortable。