Dear Manager,
My name is Ming Li, a high school student. I am looking for a summer job and I believe my skills and background are perfect to fit the position you are hiring.
I have very good English language skills and have no problems communicating with English speakers. Besides, I love invention which is part of my life. I have achieved two patents on my inventions, and I am still working on some other small invention projects. Hope I can be a great well-known inventor, like Einstein. I am easy going, active and passionate with new things.
I am looking forward to your reply and an The interview will be very much appreciated.
Sincerely,
Ming Li
I have no number, I hope it meets your requirements. However, if you are writing a composition for a high school student, I think my cover letter may have exceeded the level of your teacher. It is recommended to modify it before using it to avoid unnecessary trouble, haha.