Ключевые слова: able, achievement, attitude, blackboard, business, can, cant, chalk, chalkboard, challenge, concept, conceptual, cross, destruction, enthusiasm, erase, goal, illustration, impossible, incentive, innovation, inspiration, inspire, motivate, motivation, motivational, opportunity, optimist, persistence, plan, positive, possible, problem, progress, purpose, render, sign, solution, solve, success, support, symbol, teamwork, text, typography, unable, word, words, writing, yes,