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22. Dr. Frank failed many times but he finally_______to find a successful way to solve the problem.

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broke off    broke out    broke down    broke through  
failed    had failed    have failed    failing in  
broke off    broke up    broke down    broke through  
broke off  broke down  broke out  broke through  
in the end    after all    in other words    at the same time  
broke off    broke up    broke down   broke through  
have failed    had been failed    has failed    will be failed  
idealistic  crazy  smart  normal  
failed; got down to  have failed ;set about   have failed ;should set out  has failed; set off  
Failing    Failed    Having failed    To have failed  
failed    had failed    have failed    has failed  
broke off    broke through    broke down    broke up  
idealistic   crazy   smart   normal  

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