In order to build a healthy and civilized city,we students should try our best to behave well in many ways.First of all,we must respect old people and polite1 to others.Second,we should make our city clean every day.Don’t throw litter here and there.Third,it’s polite to say'Thank you','Please'and so on.We should never speak2 dirty words.Be friendly to others and always be ready to help others.