Ключевые слова: black, blackboard, board, business, caucasian, chalkboard, child, childhood, children, class, classroom, clever, concept, cute, decide, education, elementary, exam, example, exercises, female, formula, girl, homework, intelligence, intelligent, kid, kindergarten, knowledge, learn, learner, learning, lesson, little, marker, math, mathematics, number, portrait, preschool, red, school, schoolchild, schoolgirl, smart, solve, stationery, study, think, write,