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54. (    )

20. —I usually go to school on foot. 

—Why don't you (   ) by bus for a change?

• A、try to go
  
  

• B、trying to go
  
  

• C、to try to go
  
  

• D、try going
  
  

48. "Brain wave"machines may show (   ).

• A、the last one or two minutes of one's dream
  
  

• B、the story which lasts for hours or even days
  
  

• C、how long a dream lasts
  
  

• D、the explanations of one's dream