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It was once thought that air pollution affected only the area immediately around large cities with...

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may have thought    can have thought    may think    might think  
rises; dealing with      arouses; to be dealt with    raises; dealt with    arises; to deal with  
the exhaust valve  the starting air  the inlet valve  the fuel oil  
at once  recently  early  rapidly  
exposed    threatened    constructed    conserved  
A.While  Once   If  Until  
If    while   because   as  
They thought highly of it and accepted it at once.  They just accepted it at once without any hesitation.  They just thought it a joke.  They thought it was too artificial and took a long time to accept.  
in the distance    at once    in the open air    at a distance  
She once broke a traffic law and was fined.  She can't speak Japanese very well.  She has never before worked as an air hostess.  She doesn't feel like working long hours flying abroad.  
may have thought    can have thought    may think    might think  
fuel oil  cooling water  air compressor  auxiliary blower  
in getting    having got    in is getting    has got  
design new kind of cars, buses and trucks that will not pollute the air  protect the environment   produce cars that will not pollute the air  
That   Where   Once   As  

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