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People use metal for making machines.Metal         for making machines.

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used to    is used for    is used as    is used to  
Because it would be easier to put them together and carry them around.  Because it would be lighter for people to carry them from place to place.  Because people wanted to make it look nicer.  Because people wanted to save the expensive metal they were made from.  
studied   studying   to study   to be studied  
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