问题描述：
People began making clocks over 500 years ago .The first clocks had 0___one hand the hour hand .
People began making clocks over 500 years ago .The first clocks had 0___one hand the hour hand .The minute hand appeared at a later time .The first clocks were big and heavy .Some rich people had servants to c____ their clocks Time p____and clocks become smaller .Clockmakers were able to make smaller parts for clocks and the size were reduced .
Bells become a p____ of some large clocks in cities and towns .They were for people who were unable to s____ the clock .Some clocks were put in large towers .Many of these clocks s_____ exist today in Europe .Some of thme are 400 to 500 years old .Big ben in London is a very f____ tower clock .
The first alarm clocks were used by monks to wake thme for prayers .Today many clocks even alarm clocks are electric .
People began making clocks over 500 years ago .The first clocks had 0___one hand the hour hand .The minute hand appeared at a later time .The first clocks were big and heavy .Some rich people had servants to c____ their clocks Time p____and clocks become smaller .Clockmakers were able to make smaller parts for clocks and the size were reduced .
Bells become a p____ of some large clocks in cities and towns .They were for people who were unable to s____ the clock .Some clocks were put in large towers .Many of these clocks s_____ exist today in Europe .Some of thme are 400 to 500 years old .Big ben in London is a very f____ tower clock .
The first alarm clocks were used by monks to wake thme for prayers .Today many clocks even alarm clocks are electric .
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