13. It was buying game cards that cost Jim most of the money that he (   ) on learning. (   ) 

• A、might have spent
  
  

• B、must have spent
  
  

• C、should have spent
  
  

• D、 would have spent
  
  

51. (    )

33. (   )

• A、 gets
  
  

• B、gives
  
  

• C、attracts
  
  

• D、takes