Ключевые слова: back, back to school, blackboard, board, chair, chalkboard, class, classroom, college, concept, desk, education, elementary, empty, empty blackboard, empty room, furniture, green, indoors, inside, institute, interior, knowledge, learn, lecture, lesson, modern, nobody, primary, room, school, school blackboard, school class, schoolroom, screen, seat, student, study, studying, table, teacher, teaching,