Dear *** 2010 Expo in shanghai has been held for several months. I saw an announcement from your web site that you are seeking for volunteers, and I wish to apply for the position. I am really interested in learning business practice, and also I want to expand my scope in the Expo. If given a chance, I am sure I will do well during the time of 2010 Expo. Now I am in the summer vacation, so that you can call me at any time. Sincerely yours ***