Grammar: Word Formation - 2024 őszi

MEASURING TIME The Sumerians were the first to measure time by (0) _____ (divide) their day into 12 units. They used water clocks to keep time. Later on, the (19) _____ (Egypt) also divided the day into 12 equal units. As they used the rising and setting of the sun, the units varied in (20) _____ (long) according to the season, helping them adjust their lifestyles to the changing needs of the agricultural calendar. Due to the need for greater accuracy, more accurate devices – (21) _____ (include) sundials, candle clocks and mechanical clocks – had been developed by the 17th century. As railroads spread across the United States, people began to think about regulating time to international standards. In the early 1800s, every city in the US had its own time zone – there were a surprising 300 local sun-times in (22) _____ (use). Since running trains to a (23) _____ (rely) timetable with this system was impossible, national time zones were introduced in the US in 1883. The international 24-hour time-zone system, which serves as a time reference for the world, was established the (24) _____ (follow) year with the adoption of Greenwich Meridian Time. Clocks became more accurate with the (25) _____ (develop) of quartz clocks in the 1920s, and later the amazingly sensitive atomic clocks.