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43. How did Sally feel before she got on the bus to school alone?

• A、Proud and worried.
  
  

• B、Lonely and frightened.
  
  

• C、Delighted and surprised.
  
  

• D、Excited and nervous.
  
  

51.

18. The pain is so bad that she _____ fall asleep at all.

• A、can’t
  
  

• B、mustn’t
  
  

• C、shouldn’t
  
  

• D、needn’t