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I had to work extremely carefully, for I didn't know how long ______ to get used to the new tool.

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exactly; one    actually; one    extremely; it    sincerely; it  
it would take me  it would spend me  would it pay me  would it cost me  
I realized  I had realized  had I realized  did l realize  
whether I had finished my work or not  whether or not had I finished my work  if my work had finished or not  if or not I have finished my work  
wotking  work  to work  worked  
stayed; was intending    was staying; intended    was staying; have intended    stayed; had intended  
lastly  extremely  frequently  finally  
did you work    do you work    had you worked    have you worked  
extremely    exactly    actually    sincerely  
I had worked  did I work  was I working  would I work  
short    close    fine    narrow  
hardly I have had   hardly have I had   I have had hardly   I hardly have had  
short    close    fine    narrow  
did you work   do you work   had you worked   have you worked  

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