I. Vocabulary and Structure (10 points, 1 point for each item)
1．Small ________ it is, the pen is a most useful tool.
　　A．because         B．so         C．as         D．if   
      
2．All ________ is a continuous supply of fuel oil.
　　A．what is needed   B．the thing needed   C．for their needs       D．that is needed     
      
3．You’d like that,  _____?
　　A．don’ t you       B．wouldn’t you      C．hadn’t you          D．didn’t you   
            
4．Had electronic computers not been invented, many problems of space flight ________.
A．could not be solved        B．can not be solved  
C．could not have solved      D．could not have been solved         
   
5．“You realize that you were driving at 100 mph, don’ t you? ”
　　“No officer, I ________. This car can’ t do more than 80．”
A．didn’t need to be       B．couldn’t have been
C．may not have been     D．needn’t have been      

6．I regret ________ harder at school
　 A．not having worked       B．not to have worked
C．not have worked         D．having not worked  
        

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