Chen Qiuju and her 12-year-old student Ding Renliang pose for a picture. Ding is a left-behind child as his parents work in other places. Due to serious stomach illness he failed to advance to the next grade. Chen says, "He is the only child in class who always takes a bow when coming to the platform to listen to teachers' advice." [Photo by Chen Weisong/China.org.cn]