Ключевые слова: advertising, arm, blackboard, blank, board, business, card, career, chalk, chalkboard, class, classroom, college, copyspace, corporate, draw, drawing, educate, education, elementary, figure, green, hand, handwriting, hold, idea, information, learn, lesson, marker, message, note, paperwork, pointing, primary, professional, question, school, space, student, teach, teacher, teaching, text, university, white, work,