工作證明內容的翻譯，請幫忙

To whom it may concern20th December, 2010 .This is to certify that Mr. 123 ( holder of Identity Card No. A000000000 ) was employed as Sales Representative from 1st July, 2007 to 20th December, 2010 at Sales Department in our company.
Mr.123 left this company of his own accord. During the period of working here, he was a painstaking and responsible person.
I recommend Mr. 123 to any company(s) which will require his service without reservation.

Yours faithfully,

WWWW
( Managing Director )

2010-12-16 15:15:41 補充：
資料更正:

at Sales Department in our company. ---------不十分理想

應該是:

in the Sales Department of our company. ---------較為理想的

Certificate of Working Experience
To whom it may concerns:
This is to testify that Mr. xxx was employed as Sales Representative at Department of xxx in xxx Company.

Human Resource, Manager
xxx
December 20, 2010

"Company Seal"