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7. In April, thousands of holidaymakers remained (   ) abroad due to the volcanic ash cloud. 

• A、sticking
  
  

• B、stuck
  
  

• C、to be stuck
  
  

• D、to have stuck
  
  

二、词汇与语法知识: 共15小题; 每题2分, 共30分。从每小题的四个选择项中, 选出最佳的一项。

6. Teachers recommend parents (   ) their children under 12 to ride bicycles to school for safety. 

• A、not allow
  
  

• B、do not allow
  
  

• C、mustn't allow
  
  

• D、couldn't allow
  
  

53. (    )