【正确答案】Dear Sir or Madam:
I am a sophomore from Harbin University of Technology, and writing to you to apply for the vacancy as an English teacher-assistant in your university.
I believe that I am qualified to do the job. Firstly, I passed CET Band 4 with a high mark when I was a freshman, and I would be proud to say that I have a good command of English. Secondly, I have experience to be a teacher. For the past year, I had been an English tutor and had known well how to get along with students and help them when they are in difficulties. Last but not least, I have time to do the job this coming semester. For these points, I am convinced that I am the right person you are looking for.
By the way, besides the information you provide with, I still want to know something in detail, such as the tasks assigned to an English teacher-assistant, the working hours each week, and the pay.
I would treasure the chance and exert every effort to do the job if I am lucky to fill the position.
Thank you for considering my application.
Best regards.