Ключевые слова: advertising, advice, apprenticeship, arm, assessment, background, balance, black, blackboard, business, chalk, chalkboard, change, cheerful, coach, concept, course, customer, depression, drawing, education, emotion, face, feedback, hand, happiness, happy, idea, improvement, judgment, laughing, mood, motivation, negative, positive, presentation, psychology, sad, satisfaction, school, seminar, smile, smiley, solution, survey, symbol, training, unhappy, wall, write,