Ключевые слова: abstract, achievement, attitude, background, black, blackboard, board, business, chalk, challenge, change, concept, drawing, erasing, goal, hand, handwriting, hope, idea, impossible, improve, incentive, inspiration, instructing, leadership, letter, message, motivation, opportunity, optimist, performance, planning, positive, possible, problem, progress, remove, signs, solution, success, text, vision, white, woman, word,