解说版：

Dear Sir or Madam,

(A1 introduction) I'm Li Hua, an undergraduate from a celebrated high school. (A2 intention) On hearing the admission information of your university on the Internet, it interests me to apply for the English major among the other thirty ones in your school with my competitiveness (=advantage) listed.

(B1 education) Initially, as a remarkable (=excellent) student, my top ranking (=grade/score) at school represents (=show) my professionalism (=ability). (B2 experience) Additionally, I'm a member in the English debate team, which enables my communicative competence (=communication skills).

(else) Meanwhile, I have confidence that if I'm admitted, I'll be so proactive (=very active) to participate in the Students' Union for more English-related activities.

(C1 acknowledgement) Sir or Madam, your thoughtful consideration of my application is highly appreciated (C2 expectation) and your earliest reply is expected.

Yours Sincerely,

Li Hua

高级版：

Dear Sir or Madam,

I'm Li Hua, an undergraduate from a celebrated high school. On hearing the admission information of your university on the Internet, it interests me to apply for the English major among the other thirty ones in your school with my competitiveness listed.

Initially, as a remarkable student, my top ranking at school represents my professionalism. Additionally, I'm a member in the English debate team, which enables my communicative competence. Meanwhile, I have confidence that if I'm admitted, I'll be so proactive to participate in the Students' Union for more English-related activities.

Sir or Madam, your thoughtful consideration of my application is highly appreciated and your earliest reply is expected.

Yours Sincerely,

Li Hua

简单版：

Dear Sir or Madam,

I'm Li Hua, a Senior 3 student from a popular high school. When I notice the admission information of your university on the Internet, it interests me to apply for the English major among the other thirty ones in your school with my advantages listed.

Initially, as an excellent student, my top grades at school shows my abilities. Additionally, I'm a member in the English debate team, which improves my communication skills.

Meanwhile, I believe that if I'm admitted, I'll be so active to participate in the Students' Union for more English-related activities.

Sir or Madam, your thoughtful consideration of my application is highly appreciated and your earliest reply is expected.

Yours Sincerely,

Li Hua