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The scientists began to accumulate a huge mass of data.

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launching the gas from rockets.  releasing the gas from a big chirmley.  producing the gas from volcanoes.  spraying the gas from high-altitude planes.  
collect  handle  analyze  investigate  
collect  handle  analyze  investigate  
began    had begun    were beginning    have begun  
a. build up put up make up clear up  
collect  handle  analyze  investigate  
How   What   Where   That  
providing;for    supplying;for    offering;with    providing;with  
exactly    extremely    generally    gradually  
build up  put up  make up  clear up  
A. collect handle analyze investigate  
How   What   Where   That  
collect  handle  analyze  investigate  
to solve    to be solved    solved    be solving  
a. collect handle analyze investigate  
build up  put up  make up  clear up  
build up  put up  make up  clear up