10: has been discovered

改错：

1. least -- less 2. Preferred-- prefer

3. 在waste前加a 4. 删除but

5. Beside -- Besides 6. in -- on

7. do--doing 8. character--characters

9. neat--neatly 10. you - I

范文：

Dear Sir or Madam,

　　I am writing to apply for the opportunity to go to America. I am really interested in learning English and let me say something about myself.

　　I'm an excellent student, among the top 5 in my class. I'm crazy about English, especially spoken English. In my spare time, I read a lot, and poems are my favorite. I enjoy music very much, too. Being a young person, I like sports and outdoor activities. Besides, I'm easy to get along with and I like to make friends. I hope the journey abroad can help improve my English and that I can learn some foreign cultures.

　　I'm looking forward to your reply.

　　 Yours sincerely,

　　 Li Hua