Dear Mr XXX(负责这项项志愿活动的老师名字)
My name is Jim. I am 14 years old and a student of Moutain Peak Junior High School. I have learned that our school is looking for volunteers to help clean up the city park, which I am willing to take part. I think the cleaningness of the park is the symbol of our city's good reputation. We should keep the place clean and tidy at all time. I shall be using my free time in the weekends to do the job if you would accept my application. Thank you and look forward to hear from you soon. Best wishes!
A student of yours,
Jim
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