Ключевые слова: 10 year old, 11 year old, 30s, african american, asian, black, book, boy, child, children, class, classroom, concentrating, desk, education, elementary, encouraging, four people, girl, helping, horizontal, interactive whiteboard, learning, male, man, men, occupation, professional, pupil, school, school children, sitting, student, studying, teacher, teaching, textbook, thirties, together, tutor, working, writing,