Ключевые слова: back to school, backpack, childhood, children, classes, depression, dissatisfied, education, emotion, expression, eyes, face, flu, girl, hand, head, headache, holds, illness, infection, kid, lack of oxygen, learner, learning, mask, measures, medical mask, oxygen, pupil, put on, quarantine, sad, sadness, sars, school, security, shortage, sick leave, stress, student, study, symptoms, take off, tension, tired, unhappy, virus, young,