Ключевые слова: back, background, blackboard, board, boy, business, chalk, chalkboard, child, childhood, children, class, classmates, classroom, college, concept, count, desk, drawing, education, elementary, geometry, girl, grade, group, kid, knowledge, learn, learning, lesson, lifestyle, little, math, primary, pupil, school, schoolchild, student, study, studying, supplies, teacher, teaching, together, tutor, woman, write, writing, young,