Ключевые слова: back, book, child, concentrate, concept, dressed, education, educational, elementary, girl, grass, green, heap, holding, homework, human, information, intellectual, kid, knowledge, learning, lesson, literary, literature, little, meadow, nature, one, open, people, person, pile, pretty, pupil, reading, school, schoolchildren, schoolgirl, schoolkid, sitting, sky, stack, study, teaching, textbook, top, training, up,