Ключевые слова: back, background, black, blackboard, board, cap, chalk, chalkboard, child, class, classroom, college, concept, desk, drawing, educate, education, elementary, elements, equipment, formulas, graduation, handwriting, hat, homework, image, knowledge, learn, library, literary, literature, mathematics, maths, nobody, object, office, pencils, school, science, stack, student, study, studying, supplies, table, teacher, travel, university, wisdom, write,