12.Recently I was walking in town when I saw a group of school students in uniform.I was shocked to see that the girls' skits were very short and they were wearing a lot of make-up.The boys looked very untidy.Their shirts were dirty.I also noticed that some of the students had pierced ears and noses,which I don't think should be allowed at school. And the other day,I was on the subway when I saw some boys from a local school.These boys were making a lot of noise,chewing gum in an ugly manner,and using bad language.All the other passengers were looking at them and wondering how it was possible for these boys not to have any self-respect (自尊).They were also giving their school a very bad image which is shameful. I am a mother of two teenagers at that school and I am worried that my children may also behave like this but I do not know about it.Do school students know what is allowed and what is not allowed when they are in uniform?I think the school should be stricter with the students.And I think students should be taught how to be polite.