根据句意和汉语注释，在空格内写出单词的正确形式

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 ______ (污染) in our city now than before.
小题2:The Summer Palace is a beautiful and ________ (安静的) place.
小题3:Now many new teachers go to teach children in the _______ (西北方) of China.
小题4:It is polite of us to give our seats to （患病的）people on the bus.
小题5:When we go on a school trip, we’d better wear _______ (舒适的)clothes.