Students hold a memorial ceremony at the former residence of Li Dazhao, one of the founders of the Communist Party of China, in Laoting County, north China's Hebei Province, April 5, 2018, on the occasion of the Qingming Festival. Tomb-sweeping Day, also known as Qingming Festival, is a traditional Chinese holiday during which people pay tribute to the deceased. (Xinhua/Mu Yu)