19. The teacher was (   ) in the middle of the class because some naughty boys played tricks on her in class. 

• A、put down
  
  

• B、hung up
  
  

• C、broke in
  
  

• D、cut off
  
  

8. We should respect food and think about the people who don't have (   ) we have here and treat food nicely. 

• A、that
  
  

• B、which
  
  

• C、what
  
  

• D、whether
  
  

55.(     )