学进去

   What time is it? There are many _______ you can find out the _______.You may have a watch. You can look at a _______ on the wall. You can listen to the _______ too. It is not always easy to know the time. A long time ago people looked at the _______ 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 _______. After that people _______ small clocks so that they could carry them in their pockets (口袋). People call very small clocks _______. Now many people ________ watches.