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What time is it? There are many ways you can find out the ______. You may have a watch. You can look at a ______ on the wall. You can listen to the radio too.

It is not always easy to know the time. A long time ago people looked at the sun to tell the time. They could tell the time of day by looking at the sun in the sky: ______, noon or afternoon.

Hundreds of years later, people invented a machine called a clock. After that, people ______ small clocks. They could carry them in their pockets (口袋). People call very small clocks ______. Now many people keep watches.