Dear sir，
In reply to your advertisement in todays newspaper regarding a vacancy in your office, i wish to apply for the position of senior clerk, which you have specified.
I feel confident that i can meet your special requirements indicating that the candidate must have a high command of english, for i graduated from the english language department of _____ university three years ago.
In addition to my study of english while in the university, i have worked for three years as secretary in the firm of abc trading coltd.
The main reason for changing my employment is to gain more experience with a superior trading company like yours. I believe that my education and experience will prove useful for work in your office.
I am enclosing my personal history, certificate of graduation and letter of recommendation from the president of the university, i shall be obliged if you will give me a personal interview at your convenience.
Very truly yours.