Ключевые слова: abstract, activity, assistance, break, breaking, business, button, cancel, collapse, communication, computer, concept, conflict, connection, course, danger, delay, development, do not, education, error, fail, failure, game, industry, information, interrupt, learn, link, management, obstruction, problem, process, progress, punctuation, reject, risk, school, security, sign, solution, stability, stop, success, symbol, task, text, word, work,