A volunteer from Tsinghua University teaches kids how to make Peking Opera masks at a school in Yuquan district, Hohhot, in Inner Mongolia autonomous region, on July 12. Some 12 college students from Tsinghua University went on a volunteer teaching program in Hohhot to help them experience a colourful holiday. [Photo/VCG]

Students are amazed by a scientific experiment at a primary school in Hohhot, in Inner Mongolia autonomous region, on July 22. [Photo/IC]