2010年是西宁市创建文明城市年，市委、市政府发出号召：争创文明城市，争做文明市民。为配合此项活动，《西宁晚报》正在举办“环境因我而清洁、城市因我更文明”为主题的征文活动。请你给《西宁晚报》投稿，举出一列两个西宁市民的不文明行为，并谈一谈作为一名中学生应该如何为创建文明城市做出自己的贡献。
要求：1．文中不得出现真实姓名和校名。
2．不少于80词。开头和结尾已给出，不计入总词数。
Dear Editor，
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Best wishes!
Liu Peng
Dear editor．
I agree with you that everyone should pay more attention to our city environment.
However, some people are still doing things that harm the environment, such as spitting, dropping litter or walking across the street when the traffic lights are red. So it's time for us to do something useful to keep our city clean and tidy.
As a student, we should obey all kinds of the social rules. When we wait for a bus, we should wait in a line. When we meet the people who need help, we should help them at once. We should keep our classroom and our school clean.
If everyone tries their best to protect the environment, our city will become more and more beautiful!
Best wishes!
Liu Peng
