Earthquakes are quite common.In fact,thousands of earthquakes(1)
are happening
are happening
(happen)almost at every moment.(2)
However
However
,most of them are too weak to feel.During a big earthquake,there is often a big noise first.Then the earth shakes(3)
terribly
terribly
(terrible) and many houses fall down.
As one of the most deadly (4)
natural
natural
(nature)disasters in the world,earthquakes often result in many people being injured or killed.In 2008,a severe earthquake hit China's Sichuan Province,(5)
killing
killing
(kill) lots of people there.
Besides the great damage and (6)
deaths
deaths
(death)caused by the earthquake,other accidents such(7)
as
as
fires often follow.More buildings may be damaged and more(8)
injuries
injuries
(injure)may be caused.For centuries,people(9)
have been
have been
(be)making studies of earthquakes.It's said that about 2,000 years ago,for example,someone invented a machine which could find out the direction (10)
where
where
the earthquake waves came.