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          By the end of last term we ___________ about ten English songs.
          A．had learnedB．have learnedC．learnedD．were learning
          

			
          
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          By the end of last month, I _____ all the CDs of Justin Bieber.
          A．collectB．collectedC．have collectedD．had collected
          

			
          
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          By the end of the last month, I _____________ all the CDs of Justin Bieber.
          A．collectB．collectedC．have collectedD．had collected
          

			
          
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          By the time we rushed to the hall, the party ________ for ten minutes.
          A．had begunB．beganC．was onD．had been on.
          

			
          
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          By the time she went outside, the bus ____ already ______ .
          A．had, goneB．had, went C．has, goneD．has, went
          

			
          
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