A volunteer sings an English song for left-behind children at Maolong Primary School of Wangdun Township in Duchang County, east China's Jiangxi Province, July 11, 2013. Twenty-four student volunteers of the Wuchang Branch of Huazhong University of Science and Technology came to the primary school to carry out 20-day education support activities for about 200 left-behind children in the summer vacation. (Xinhua/Hu Guolin)