A、Changing work style in the United States. B、Shorter workweek resulting in increasing automation. C、Regular practice of 40 hour

A study has shown that here in the United States, we’ve experienced the revolution concerning our attitudes towards the workweek and weekend. Although some calendars still mark the beginning of the week "Sunday", more and more of us have come to regard Monday as the first day of the week with Saturday and Sunday comprising the two-day periods thought of as the weekend. In fact, the word "weekend" didn’t even exist in English until about the middle of the 19th century. In England at that time, Saturday afternoons had just been added to Sundays and holidays as a time for workers to have off from their jobs. This innovation became common in the United States in the 1920s. But as the workweek shortened during the Great Depression of the 1930s, the weekend expanded to two full days, Saturday and Sunday. Some people thought that this trend would continue due to increasing automation and the workweek might decrease to four days or even fewer. But so far, this hasn’t happened. The workweek seems to have stabilized the 40 hours made up of five eight-hour days. Next time I’m going to talk about the idea of adding Monday to the weekend.(199)
Question No. 15 When did the word "weekend" begin to exist in the English language?
Question No. 16 When did American people begin to have two-day weekend?
Question No. 17 What did some people predict from increasing automation?
Question No. 18 What is the speaker going to talk about next time?