Ключевые слова: alarm, algebra, back, background, blue, calculator, classes, clock, college, copybook, courses, education, equation, exercise, eyeglasses, flat, formula, homework, knowledge, lay, learn, learning, lesson, math, mathematical, mathematics, maths, notebook, object, paper, pen, pupil, ruler, school, september, sheet, stationery, student, study, studying, subject, supplies, task, teach, teaching, time, top, university, view, word,