如何写好英文的求职信

dear sir,

i would like to apply for the position of secretary which you advertised in jobspower.com. i have been handling most of the secretarial work at my present company for the past two years, and i feel that i can qualified to fill your position.i am enclosing a brief resume as you requested. please let me know if you want an interview.one reason that i would like to be employed with your firm is that you are dealing with import and export trade. i would look forward to dealing with overseas companies and at the same time having a chance to use english more.