Ключевые слова: beautiful, boy, bulb, child, childhood, children, class, classroom, concept, desk, doodles, education, elementary, exam, girls, grade, group, happy, idea, indoors, junior, kid, kids, knowledge, learning, lesson, mathematics, notebook, pen, people, person, preteen, primary, pupil, school, schoolboy, schoolchildren, schoolgirls, schoolkids, signs, smiling, stack, student, students, studying, subjects, symbols, test, writing, young,