Ключевые слова: 10 years old, 9 years, boy, caucasian, childhood, children, class, classmate, classroom, copybook, desk, drawing, education, elementary, exam, exercise, experiment, girl, grade, group, indoors, junior, kid, knowledge, learning, lesson, little, people, person, preteen, primary, public, pupil, school, schoolboy, selective, sitting, study, task, teens, test, thinking, together, work, writing, young,