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Someone has calculated that by the time an American reaches the age of 40, he or she has been expose...

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controlled    considered    calculated    completed  
a coffee cup; has done    a cup of coffee; did    a cup for coffee; did    a coffee's cup; has clone  
calculated  considered   completed  controlled  
that    what    which    whether  
5 volts, the output changes 10 volts  10 volts, the output changes 5 volts  2 volts, the output changes 10 volts  10 volts, the output changes 2 volts  
has been talking   was talking   has talked   Talked  
It’s wet and it was wet in the last few days. A. was using    must have used    has been using    has used  
can; it   /;/   would; it   may;/  
is seriously ill  has a rich imagination  is a bad writer  has a serious injury to the leg  
did; steal    have; stolen    has; been stolen    was; stolen  
calculated  considered  completed  controlled  
calculated  considered  completed  controlled  
was calculated  was figured   calculated  figure  
competition  objective  subject  core  
broke    has broken    will break    was breaking  
what  that  which  whether  
someone who has little to do  someone who enjoys no spare time  somebody who is wandering about with nothing to do  as many people as possible  
It contains no less than 2.5% of hydroxyanthracene derivatives,calculated asrhein.  It contains down to 2.5% of hydroxyanthracene derivatives,calculated asrhein.  It contains more than 2.5% of hydroxyanthracene derivatives,calculated asrhein.  It contains up to 2.5% of hydroxyanthracene derivatives,calculated asrhein.  It contains not less than 2.5% of hydroxyanthracene derivatives,calculated asrhein.  
is waiting; went    waits; went    is waiting; has gone    waits; has gone  

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