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Among the problems is _____ they often failed to take into account that those people are more likely...

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came    had come    was coming    has come  
prior  among  throughout  selected  
poor quality rails and unreliable stopping systems  lack of financial support for development  limited railroad lines  lack of a transcontinental railroad  
As far as    As long as    As well as    As soon as  
has come    comes    had come    was coming  
grows    was growing    has been growing    has grown  
thought that they knew a great deal and could solve most problems of science  were afraid of facing up to the realities of scientific research  knew that they were ignorant and wanted to know more about nature  did more harm than good in promoting man's understanding of nature  
settled   settling   to settle   to be settled  
painful headache.  indigestion,  loss of memory.  nervousness and concentration problems.  
that    what    when    Where  

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