46. We'd better have our meals (   ). 

• A、at the same time each day
  
  

• B、when our work is over
  
  

• C、when the meal is not hot
  
  

• D、when everyone is at home
  
  

8. We (   ) have proved great adventurers, but we have done the greatest march ever made in the past ten years. 

• A、needn't

• B、may not

• C、shouldn't

• D、mustn't

52.(      )