Ключевые слова: back, background, blackboard, board, book, business, chalk, chalkboard, class, classroom, closeup, college, color, colorful, concept, design, desk, drawing, education, elementary, equipment, eraser, formulas, green, handwriting, homework, knowledge, learn, library, message, nobody, note, notebook, object, office, pen, pencil, school, space, stack, stationery, student, study, studying, supplies, table, teacher, textbook, university, write,