Students have fun popping balloons by stepping on them at a high school in Yangzhou, East China's Jiangsu province, May 23, 2011. Seniors took part in activities such as popping balloons, tossing paper and flying paper airplanes to relieve some pressure from preparing for Gaokao, the national college entrance examination, which will take place June 7 - 9 this year. [Photo/CFP]
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