[解析]
Dear Sir or Madam,
My name is Li Hua.And I am writing to apply for being a volunteer of our school English association.【参加应聘】
I have a good command of English and have been to the USA twice.(高分句型一) So I can communicate well with native speakers of English.What's more,I am kind and friendly to other people.So I can easily get along with foreign students.I'm particularly interested in this job because I want to further improve my oral English capabilities and interpersonal communication skills.(高分句型二)At the same time,I need this job with the hope of making more friends.【自我介绍】
Hopefully I can receive your acceptance.【表达愿望】
Yours faithfully,
Li Hua