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1. Thousands of years ago man used handy rocks for his surgical operations. Later he used sharp bone...

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since the last century  for a very long time  since a few hundred years ago  since a few years ago  
dates from; is belonging to    dates back to; belongs to    dated from; is belonged to    dated back to; belongs to  
New Stone Man  Silk Man  Peking Man  India Man  
for; Through    as; During    for; Over    on; Over  
much easier than  as easy as  as hard as  much harder than  
lived    living    live    was living  
since the last century  for a very long time  since a few hundred years ago  since a few years ago  
thousands   thousand   thousand of   thousands of  
that; may   that; must   what; may   what; should  
thousands of    two thousands of    thousand of    thousand  
how    what    where    that  
to punish people who had broken the law  to keep dead bodies from decay  to keep fish alive  to make chemicals  
a ; the    the ; /    the ; an    a ; /  
Thousands,three hundred  Thousands,three hundreds   Two thousands,three hundred  Two thousand,three hundreds  
New Stone Man  Silk Man  Peking Man  India Man  
to punish people who had broken the law  to keep dead bodies from decay  to keep fish alive  to make chemicals  

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