U.S. Secretary of Agriculture Tom Vilsack, back row left, U.S. Trade representative Ron Kirk, back row 2nd left, U.S. Commerce Secretary Gary Locke, back row 3rd left, and China's Vice Premier Wang Qishan, back row 3rd right, and other officials witness the signing ceremony of the 20th China and U.S. Joint Commission on Commerce and Trade Thursday Oct. 29, 2009 in Hangzhou, China.