Ключевые слова: background, book, calculus, caucasian, child, class, classroom, desk, education, elementary, european, expertise, explanation, female, friends, girl, glasses, grade, group, happy, indoors, learn, learning, lesson, notebook, people, person, primary, pupil, reading, school, schoolboy, schoolchildren, secondary, sitting, smile, student, studious, study, teacher, teaching, together, tutor, woman,