SHANGHAI, Jan. 5, 2012 (Xinhua) -- Shanghai mayor Han Zheng (R, back) shakes hands with Hong Kong Special Administrative Region (HKSAR) Chief Executive Donald Tsang (L, back) at a signing ceremony held during the Shanghai-Hong Kong Economic and Trade Cooperation Conference in east China's Shanghai Municipality, Jan. 5, 2012. Shanghai and Hong Kong signed here on Thursday a series of cooperative agreements within such sectors as commerce and trade, culture, civil service and medical care. (Xinhua/Pei Xin)