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The sun was … first clock. He watched it rise in the east, move across the sky, and set … the west. Then he … that the shadow of the tree changed in length and position as the sun moved across the sky. He … say to … friend, "Come to my house when the shadow of the great oak reaches the white stone". But people could not tell the … by shadows on cloudy days or … night, so they began looking for other ways to tell the time.
… first real mechanical clock … more than nine hundred years ago. It had no face or hands. Bell rang to tell the hour. Today's clocks … by electricity.
in / at / a / the / time / man / to find / to be made / to be run / may