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

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But  So  Although  However  
broke off    broke up    broke down    broke through  
broke off  broke down  broke out  broke through  
A./;a    a;the    his;the   /;/  
broke off    broke up    broke down   broke through  
faith  belief  credit  reliance  
have failed    had been failed    has failed    will be failed  
again and again  once more  less  over and over again  
again and again  once more  less  over and over again  
when    after    before    until  
Failing    Failed    Having failed    To have failed  
method    way    means    approach  
broke off    broke up    broke down    broke through  
broke off    broke through    broke down    broke up  
Although    Because    Unless    Since  

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