Students attend class at the Jiuzhou Tent School in the Jiuzhou Gymnasium in the quake-hit Mianyang City, southwest China's Sichuan Province, May 20, 2008. A total of 2,485 primary school pupils and middle school students evacuated from quake-hit areas including Beichuan and Anxian counties of Mianyang City resumed class at the temporary school, opened on May 20.(Xinhua Photo)

Xie Ziting (L), a nine-year-old girl from Beichuan County, plays games with a classmate during a break at the Jiuzhou Tent School in the Jiuzhou Gymnasium in the quake-hit Mianyang City, southwest China's Sichuan Province, May 20, 2008. A total of 2,485 primary school pupils and middle school students evacuated from quake-hit areas including Beichuan and Anxian counties of Mianyang City resumed class at the temporary school, opened on May 20. (Xinhua Photo)

Wang Jiawen, a grade one pupil, attends class at the Jiuzhou Tent School in the Jiuzhou Gymnasium in the quake-hit Mianyang City, southwest China's Sichuan Province, May 20, 2008. A total of 2,485 primary school pupils and middle school students evacuated from quake-hit areas including Beichuan and Anxian counties of Mianyang City resumed class at the temporary school, opened on May 20.