Ключевые слова: analysis, benefit, blackboard, blank, board, business, button, chart, choose, circle, click, concept, confident, display, division, economics, economy, education, empty, enter, focus, formal, graph, group, idea, margin, marketing, monitor, new, pattern, plan, progress, sales, select, selective, share, success, suit, teach, teacher, team, template, texture, user, white, work, write, writing,