A student mops the floor at No. 4 Primary School in Hezuo City of Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province, Aug. 27, 2019. 1,068 students of the Tibetan ethnic group from six grades in 24 classes welcomed the new semester that began in No. 4 Primary School in Hezuo City Monday. Apart from required courses, interests-oriented classes including classical literature, football and dance were also launched to help enrich students' extracurricular time. (Xinhua/Chen Junqing)