1. 写信目的；2. 个人优势；3. 能做的事情。
注意：1. 词数100左右；2. 可以适当增加细节，以使行文连贯；3. 结束语已为你写好。
Dear Sir or Madam,
How are you doing? I am Li Hua, a 17-year-old teenager, who is crazy about different cultures around the world.Recently, I learned in your official website that a volunteer is needed for an exhibition of Chinese traditional painting in London. So I am writing to apply for this position.
Here are three main reasons why I am the best choice for you. First and foremost, having lived in London for half a year before as an exchange student, I am undoubtedly good at English; as a result,it is a piece of cake for me to introduce everything to international friends.Besides, I learned Chinese painting for more than ten years in my childhood;therefore, I do know a lot about this great art form. Last but certainly not least,as vice monitor of our class, I am kind, patient and always ready to help others.
Hopefully, this wonderful chance would be offered to me. I have the confidnece that I will have a great time. Looking forward to your reply.
Dear Sir or Madam,
1.开头问候 How are you doing?
2.自我介绍 I am Li Hua, a 17-year-old teenager currently studying in XXX middle school, who is crazy about XXX.
3.得知招聘信息 Recently, I learned in your official website that you need a 某某岗位. I am very interested in this position.
4.写信应聘 So, I am writing to apply for it.
5.个人优势 From my perspective, there is no doubt that I am the best choice for you.
6.优势一：结合题目来写 First and foremost, needless to say, I am good at; 某某方面, for I once did sth.
7.优势二：情商高 Additionally, no one can deny I get along well with all my classmates, enjoy a harmonious inter personal relationship and am always ready to help others.
8.优势三：有相关经验 Last but not least, I have some relevant experience, considering that I once worked in a similar company/for a similar activity.
9.希望得到这个机会 Hopefully, the wonderful chance would be offered to me./I have the confidence that I will do this job well.
10.期待回复 I am looking forward to your earliest reply.