How could we tell time if there were no watches or c---1---a

How could we tell time if there were no watches or c___1___anywhere in the world?The sun was probably the world's first "clock".except in de far north,where the Eskimos(爱斯基摩人)l___2___.There,it's dark most of the winter,and light most of the summer.But in the world,people have used the sun.Today,if you don't have a clock that shows time ,you still know that when the sun shines ,it's day,and when it's dark ,it's n___3____.The sun can't only tell you whether it's day or night but a__4__ it's morning ,noon,or afternoon.When the sun is almost directly overhead,it's noon.people who live near the sea tell time ___5___the tides.In the daytime,for about six hours,the water rises higher and h___6__on the beach.There are two high tides and two low tides every 24 hours.
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Mrs.Green is an American woman.She lives in Washington.Her husband is a d___1__.He works in a hospital.Mrs.Green has two c__2__ .They are Tom and Kate.They go to school from M___3__ to Friday.They go to school early in the morning and come back late in the a__4__.Tom,Kate and their father don't often have l___5__ at home,but they have dinner at tome with Mrs.G__6__.
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