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    (look) up every new word in the dictionary will certainly be a waste of time.

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don't have to    shouldn't    can't    mustn't  
look up   consult   refer   discuss  
can’t    mustn’t    don’t have to    shouldn’t  
afraid to    listen for    complete up    look up  
look for    look out    look up    look after  
can’t       mustn’t      don’t have to    ought not to  
look for    look up    look at    look after  
look on    look for    look up    look out  
look up    refer to    look for    look into  
refer to    look up    not refer to    not look up  
look up a dictionary  look up an dictionary  look it up in an dictionary  look it up in a dictionary  
look for    look up    look at    look after  
give up    put up    look for    look up  
can’t    mustn’t    don’t have to   ought not to  
can’t    mustn’t    don’t have to    ought not to  
look up it  look it up  look up them  look them up  
look up  consult  refer  discuss  
don't have to    shouldn't    can't    mustn't  
come up with    come out    come along with    come across  

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