Ключевые слова: adult, arms, back, beautiful, blackboard, caucasian, chalk, chalkboard, cheerful, child, class, classmates, classroom, concept, cute, day, desk, development, education, elementary, female, girl, green, hair, hands, happy, knowledge, learn, learning, lesson, math, people, person, portrait, pretty, pupil, question, school, schoolchild, smile, smiling, standing, student, study, teacher, teachers, teaching, up, woman, young,