答案：
One possible version：
Dear_editor，
I_am_Li_Hua,_a_Senior_Two_student. Over the past two years, I have studied hard, but I haven't learnt English well, especially in reading. Besides, I seldom asked my teacher and classmates questions. The summer holiday is coming. I've made up my mind to make an improvement.
To begin with, I will finish my homework, read a lot of reading materials in English and ask my teachers and classmates questions by emails or QQ. In addition, I will do some volunteer work and help those who are in need of help, learning more social experience.
Next term, I will study harder than before. Not only will I learn basic knowledge but also I will improve my reading ability. I am determined to get a high mark in the College Entrance Examination and be admitted to a key university.
Hoping_to_receive_your_early_reply.
Yours，
Li_Hua
