Ключевые слова: accessory, back, background, clean, college, color, copy, correct, correction, education, elastic, element, equipment, erase, eraser, flat, geometry, green, group, item, knowledge, lay, learning, lesson, many, math, nobody, object, office, pencil, pupil, removing, rub, rubber, ruler, school, space, stationery, student, study, studying, supplies, text, tool, top, undo, university, view, white, work,