Ключевые слова: basic, book, boy, brothers, caucasian, child, childhood, classroom, concentrate, concept, count, development, education, educational, hand, homework, innocence, isolated, kid, learn, letters, light, math, notebook, number, pencil, picture, play, preschool, read, recognize, school, schoolboy, skill, small, smile, son, start, student, study, success, think, together, two, up, white, win, write, youth, youthful,