Ключевые слова: apple, back, background, blackboard, board, book, books, bright, calculation, callipers, chalk, chalkboard, class, classroom, clear, college, color, colorful, concept, desk, education, fruit, green, happy, homework, laptop, math, nobody, number, numbers, object, organized, paint, paper, pencil, pile, plasticine, pupil, school, stack, student, study, table, tablet, teach, teacher, teaching, wooden, young,