Ключевые слова: 4k, attention, boy, boys, childhood, children, class, classroom, communication, concentrating, day, diversity, education, elementary, elementary school, explaining, girls, group, junior, junior school, kids, knowledge, learning, lesson, listening, man, middle school, mixed race, multi ethnic, multicultural, people, preteen, primary, pupils, room, school, schoolchildren, schoolgirl, science, sitting, smart, students, study, studying, talk, teacher, teaching, whiteboard, young,