Resumption of classes At present, high-risk areas and low-risk areas, such as Chashan, Zhangmutou, Chang 'an, Humen and Fenglan, have been lifted in some areas of Dongguan City, Guangdong Province, and the measures have changed. In some areas, primary and secondary school students have been informed to return to school, and the time for students to return to school is subject to the school notice. Nowadays, in many places, the classification of returning students is more accurate.