Students wait to wash their hands before entering classroom at a primary school in Dar es Salaam, Tanzania, on June 29, 2020. Primary and secondary schools in Tanzania reopened on Monday. (Xinhua)

Students queue up to wash their hands before entering classroom at a primary school in Dar es Salaam, Tanzania, on June 29, 2020. Primary and secondary schools in Tanzania reopened on Monday. (Xinhua)

Students queue up to wash their hands before entering classroom at a primary school in Dar es Salaam, Tanzania, on June 29, 2020. Primary and secondary schools in Tanzania reopened on Monday. (Xinhua)

Students attend class at a primary school in Dar es Salaam, Tanzania, on June 29, 2020. Primary and secondary schools in Tanzania reopened on Monday. (Xinhua)