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The elephants ought ______ hours ago by the keepers.

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They kept detailed records of all the elephants in their care.  They compared zoo elephants with wild elephants.  They analyzed the records of 800 elephants kept in zoos.  The zoo-born elephants they studied were kept in European zoos.  
It may not be a wise policy to keep elephants in the zoo.  Elephants are no longer an endangered species.  Zoo-born elephants should be looked after more carefully.  Zoos should keep more animals except elephants.  
Male elephants are hunted more than female elephants  Both male elephants and female elephants are equally hunted  Each elephant has a long life  There are not any ivory hunters in the world now.  
Female elephants live longer than male elephants.  Female zoo elephants live longer than their wild counterparts.  Female zoo elephants die much earlier than their wild counterparts.  Elephants in zoos and those in the wild enjoy the same long life spans.  
They compared zoo elephants with wild elephants.  They kept detailed records of all the elephants in their care.  They analyzed the records of the elephants kept in zoos.  The zoo-born elephants they studied are kept in European zoos.  
They compared zoo-born elephants with wild elephants.  They analyzed the records of 800 elephants kept in zoos.  The zoo-born elephants they studied were kept in European zoos.  They kept detailed records of all the elephants in their car  
it may not be wise to keep elephants in zoos.  zoo-born elephants should be looked after more care.  zoos should keep more animals except elephants.  elephants are no longer an endangered species.  
house   horses   service   houses  
It may not be a wise policy to keep elephants in the zoo.  Elephants are no longer an endangered species.  Zoo-born elephants should be looked after more carefully.  Zoos should keep more animals except elephants.  
HOU HKG 1377154  NIL  040829F  HB0001856  
lived longer.  grew up faster.  died much earlier.  enjoyed the same life spans.  
They compared zoo elephants with wild elephants.  They kept detailed records of all the elephants in their care.  They analyzed the records of the elephants kept in zoos.  The zoo-born elephants they studied are kept in European zoos.  
one hou  half an hou  a few minute  zero"  
Female elephants live longer than male elephants.  Female zoo elephants live longer than their wild counterparts.  Female zoo elephants die much earlier than their wild counterparts.  Elephants in zoos and those in the wild enjoy the same long life spans.  
zoo-born elephants should be looked after more carefully.  zoos should keep more animals except elephants.  it may not be wise to keep elephants in zoos.  elephants are no longer an endangered species.  
live longer.  grew up faster.  enjoyed the same life spans.  died much earlier.  
to; ought to    /; ought    ought; ought    /; ought to  

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