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11. Mistakes don't just happen; they occur for a reason. Find out the reason and then making the mistake becomes (   ). 

• A、favourable
  
  

• B、precious
  
  

• C、essential
  
  

• D、worthwhile
  
  

49. If a person says that he had a dream that lasted for four hours, (   ). 

• A、he is lying purposely
  
  

• B、he is trying to be funny
  
  

• C、he is honest and accurate(精确的)
  
  

• D、he is mistaken
  
  

54. (    )