19. That was (   ) thing that I had to stay at home taking care of my sister.

• A、a such terrible
  
  

• B、a so terrible
  
  

• C、such terrible
  
  

• D、so terrible a
  
  

51. (     )

41. Many people wrote to Johnson to find out (   ).

• A、what kind of whisky he had
  
  

• B、how to live longer
  
  

• C、how to become wealthy
  
  

• D、in which part of the neck to have an injection