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Many difficulties have ________ as a result of the changeover to a new type of fuel.

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to solve    solving    solved    solve  
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many difficulties    many difficulty    much difficulties    much difficulty  
risen    raised    arisen    arrived  
stay up    cheer up   give up    take up  
could have gone through  would have gone through  will have gone through  must have gone through  
risen    arisen    raised    aroused  
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