Ключевые слова: book, books, bookstore, break, case, concept, diet, eating, education, food, fresh, green, hamburger, health, heap, homework, isolated, knowledge, learning, library, literature, lunch, nutrition, objects, pages, paper, plastic, reading, red, sandwich, school, schooling, science, snack, stack, student, study, supplies, teaching, textbook, university, vegetables, white, wisdom,