Ключевые слова: 910, boy, caucasian, child, children, class, classroom, concentration, desk, education, educator, elementary, female, girl, group, helping, indoors, interest, junior, kids, learning, lesson, listening, male, old, people, primary, pupil, school, schoolchildren, schoolgirl, sitting, smiling, study, study room, studying, table, talking, teacher, teaching, together, whiteboard, woman, year, years, young,