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In the past, Americans used to think of the United States as a “melting pot” of immigrants(移民) from...

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having used    use    used    using  
Americans may run short of water in the future.  Americans use more water than ever.  Americans use as much water as they used to.  The more things Americans like to have, the more water is neede  
Americans don’t have enough water.  Americans don’t use enough water.  Americans like to use water.  Americans use too much water.  
3 times bigger than the past.    bigger than 3 times in the past.    the 3 times size of its past.   3 times bigger than it was.  
isn''t there    didn''t there    usen''t it    used not it  
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weight  height  life span  head size  
important to Americans  useful for children only  used as a telephone  only used by doctors  
used to eating  are used to eating  are used to eat  used to eat  
Germen; American    Germans; American    Germans; Americans    Germen; Americans  
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used to keep   used to be used for keeping   was used to keeping   used to be used to keeping  
used to taking  are used to taking  used to take  are used to take  
walking, watching   walking; watch   walk; watch   walk; watching  
eat, eat    eat, eating    eating, eating    eating, eat  
Entertainment in small towns.  Americans' adjustment to a moving society.  The life style of Americans in the past.  Personal relations in small communities.  
be ;cooling   be; cool   being; cool   being; cooling  
used to, is used to    was used to, is used to    is used to, used to    used to, was used to  
be ;cool  be ;cooling  being; cool  being ;cooling  
used to keep   used to be used for keeping   was used to keeping   used to be used to keeping  

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