Ключевые слова: assisting, book, child, childhood, class, classroom, difficult, difficulty, document, doing, educate, education, educational, elementary, exhausted, explaining, family, father, focused, formula, helpful, helping, home, homework, kid, learning, lifestyle, mathematics, mother, notebook, number, parent, pen, pencil, school, schoolgirl, sitting, student, study, studying, teaching, together, work, writing, young,