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spends/in spent/on has spent/on had spent/in
is spent has been spent was spent had been spent
spent；to build spent；building paid；for cost；on
were spending spent are spending have spent
sharing using denying developing
25 years 50 years hundreds of years a few years
25 years 50 years hundreds of years a few years
within scientists have out what is
sharing using denying developing
sharing using denying developing
sharing using denying developing
25 years 50 years hundreds of years a few years
he spent years writing about the place he lived in he took quite a long time finding a suitable place to live he spent years looking for a certain village he lived in a Himalayan community for many months
a;\ the ; which a; where the; that
sharing using denying developing
spent has spent has taken take
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