询问未果，再次请求还

　　Dear Mr.Wang,

　　Although we have sent you 2 letters regarding your past-due account of$15 000,we have heard nothing from you.

　　We hope you understand we are unable to continue waiting patiently in ?silence.Please do not disappoint us once more.If your check is already in the mail，please ignore this letter.?　　

　　Yours sincerely,