Ключевые слова: book, child, childhood, concentrate, concentration, cute, develop, development, education, educational, elementary, happy, home, intelligence, kid, knowledge, learn, learning, lesson, little, looking, notebook, one, only, paper, pen, pencil, people, person, portrait, preschool, reading, research, school, schoolboy, serious, sitting, small, son, student, study, studying, table, teenager, thinking, work, write, writing, young, youth,