Children guided by a policewoman and a teacher escape from a building during a drill in Nanjing experimental kindergarten in Nanjing, capital of east China's Jiangsu Province, May 10, 2010. The drill was held Monday in Nanjing, aiming at teaching children to escape from buildings and to protect themselves when earthquakes happen. [Photo/Xinhua]

Couples participate in a group wedding ceremony hosted by the French Pavilion at the Shanghai World Expo site in Shanghai May 11, 2010. [Agencies]