Dear Sir/Madam，
I'm glad to see your advertisement on the Internet．Willing to be a teaching assistant in your training center this summer，I'm writing to apply for the position．
In order to gain some valuable working experience，I want to seize this opportunity to improve myself．Devoted to learning English for years，I think I'm equal to the job because I am capable of communicating with foreigners in English．Besides，being a monitor in my class makes me a brilliant organizer，which helps me accumulate many strategies on how to coach others efficiently．Most importantly，many of my teachers describe me as"responsible and diligent"，and I believe these good qualities contribute to cooperating well in a team．
I'd appreciate it if you could take my application into consideration．
Looking forward to your early reply．
Yours sincerely，
  Li Hua Dear Sir/Madam，
I'm glad to see your advertisement on the Internet．Willing to be a teaching assistant in your training center this summer，I'm writing to apply for the position．
In order to gain some valuable working experience，I want to seize this opportunity to improve myself．Devoted to learning English for years，I think I'm equal to the job because I am capable of communicating with foreigners in English．Besides，being a monitor in my class makes me a brilliant organizer，which helps me accumulate many strategies on how to coach others efficiently．Most importantly，many of my teachers describe me as"responsible and diligent"，and I believe these good qualities contribute to cooperating well in a team．
I'd appreciate it if you could take my application into consideration．
Looking forward to your early reply．
Yours sincerely，
  Li Hua