Ключевые слова: back, blackboard, boys, child, childhood, children, class, classmate, classmates, classroom, desk, diversity, education, elementary, explaining, grade, group, homework, indoor, indoors, junior, kid, kids, knowledge, learn, learners, learning, lesson, little, many, people, person, primary, pupil, rear, school, schoolboys, schoolchild, schoolchildren, schoolgirls, schoolkids, sitting, study, studying, teacher, teaching, together, young, youth,