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Within 80 years, some scientists estimate, the world must produce more than eight times the present ...

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within the next 200,000 years  only 200,000 years from now  only 150,000 years from now  as soon as the planet becomes cool enough  
that      it      too      very  
indicated    promised    supported    predicted  
indicate    promise    support    predict  
which people supposed   which people supposed it   which people supposed that is   people supposed that  
is  will be  would be  was  
Having studied   Studied   To study   Studying  
1 year  2 years  3 years  4 years  
damaged   ruined   spoiled   destroyed  
outside  beyond  under  within  
within  scientists have  out what  is  
no; easy for    some; within    any; within    any; beyond  
probable; some kinds    likely; of some kind    possible; some kind of   unlikely; some kind of  
no; easy for    some; within    any; within    any; beyond  
in    during    throughout    within  
cheaper  cheapest  cheap  more cheap  

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