Ключевые слова: book, college, concept, educate, education, educational, elementary, grass, green, high, hobby, idea, information, knowledge, lawn, learn, learning, lesson, life, literature, message, natural, nature, nobody, object, outdoors, outside, paper, park, pile, positive, primary, reading, relax, research, school, science, spot, spring, stack, student, study, summer, teach, textbook, yard,