17. There is much chance (   ) Bill will recover from his injury in time for the race. 

• A、that
  
  

• B、which
  
  

• C、until
  
  

• D、if
  
  

43. The passage is mainly about (   ). 

• A、a group of cold-water-swimming lovers
  
  

• B、the Polar Bears' life in New York
  
  

• C、doctors' ideas about cold-water swimming
  
  

• D、the requirements of the Polar Bear Club
  
  

53. (    )