Singers perform during a celebration held in Shanghai's Luwan Gymnasium on Tuesday night, April 29, 2008, marking the 100-day countdown of the 29th Olympic Games.(Xinhua Photo)

Two children pose for a photo in front of the Beijing Olympics countdown board at the Chinese National Museum in Beijing, capital of China, April 29, 2008. April 29 marked the 100-day countdown of the 2008 Beijing Olympics. (Xinhua Photo)