写一篇关于礼貌的文章，大致内容如下：礼貌对每个人来说都非常重要。有礼貌的人从来不在别人危急的时候讥笑他，相反却去帮助他。办事的时候要说“请”，“谢谢”。在公共场合不要大声喧哗。当你打喷嚏时或吐痰时要用手帕。作为一名学生上课不要迟到。如果迟到了，要向老师道歉。　　可以合理添加相关内容，词数 100 左右。　　提示：打喷嚏— sneeze ；吐痰— spit　　Manners are important to happy relations among people. No one likes a person with bad manners. A person with good manners never laughs at people when they are in trouble. Instead， he tries to offer help. When he asks for something， he says “please” and when he receives something， he always says “thanks”。 He does not interrupt other people when they are talking. He does not talk loudly or laugh loudly in public. When he sneezes or spits， he uses a handkerchief. As a sutdent， it is a bad manner to come late to class. If you are late you should say “I'm sorry.” to the teacher at the time or after class.