A girl shows a board with a smiling face during an activity to celebrate the upcoming World Smile Day at No. 10 Middle School in Xingtai, north China's Hebei Province, May 7, 2009. The World Smile Day falls on May 8. (Xinhua/Chen Lei)
Students form a sign of a smiling face during an activity to celebrate the upcoming World Smile Day at No. 10 Middle School in Xingtai, north China's Hebei Province, May 7, 2009. (Xinhua/Chen Lei)
