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            • 1． —Have all the important letters been delivered at the first time?

                 — I’m sorry . ________ only 30% of them. 

                  

              A．There are
              B．It is
              C．There are
              D．It has been
              难度：易
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            • 2．
              I’m afraid there might have been 1000 audience in the concert last night, _____?
              A．am not I        
              B．aren’t I            
              C．mightn’t there 
              D．weren’t there
              难度：易
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