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After working on the maths problem for hours,he found________ he thought was the key to it.

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After all    Above all    At all    In all  
look for    look after    look at    look like  
on his own    in his own    of his own    for his own  
had been working; had had    have been working; had    have been working; have    am working; will have  
Though    When    Before    After  
devotes; look after    spends; looking after    devotes; looking after    provides; looking after  
to work out  working out  work out  worked out  
working out    work out    to work out    works out  
to;working  of;to work  for;to work  of;working  
What      How   Why     Which  
have; work  has; working   had; worked  having; working  
he began  that he began   he did begin  did he begin  
on his own  in his own  of his own  for his own  
did he begin   he began   he did begin   began he  
over    in    about    through  

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