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      What time is it? There are many ways you can find out the time. You may have a watch on your wrist (手腕). You can look at a clock on the wall. You can listen to the radio, watch TV or ring a number on the telephone to get the time. But do you know the history of how people tell the time?
       It has not always been easy to know the time. A long time ago people looked at the sun to tell the time. They could tell the time of the day by looking at the sun in the sky: morning, afternoon or evening.
       Around the year 1400, people began to use the hourglass(沙漏). It’s made of glass with some sand in it. It’s wide at both ends, but narrow in the middle. The sand ran from one end to the other in one hour. At the end of every hour, people turned the glass over and began again.
       Hundreds of years later a machine called clock was invented. After that people made small clocks, so that they could carry them in their pockets. Then, during World War Ⅰ men started wearing their watches on their wrists. It was more easily to tell the time. Now almost everyone wears a wrist watch.

The history of telling the time
【小题1】 1400	People could tell the time by 【小题2】 the sun in the sky.
Around the year 1400	People used the hourglass which was made of glass with some sand in it. The sand took an 【小题3】 to run from one end to the other end.
After 1400	People 【小题4】 the clock, then they carried small clocks in their pockets.
During World War Ⅰ	People wore watches on their wrists. It was 【小题5】 to tell the time.