David received a parrot for his birthday. The parrot had a poor vocabulary, and many were not ____. David tried hard to change the bird's words and was often saying polite words, ____ soft music, trying anything he could  think of to set a good example. But nothing ____. He shouted at the bird and the bird just got angry and became____ less polite .Finally，without any hope，David put the bird in the fridge. For a few moments he heard the bird kick and cry ____ in it. Then suddenly it was quiet-not a sound for half a minute. David was frightened that he might have hurt the bird and quickly opened the fridge door. The parrot quietly ____ out onto David's arm and said，"I believe that I may have made you angry ____ me about my impolite language and ____ . I will try my best at once to be polite. I am really sorry and beg ____ pardon. "

    David was surprised at the bird's change，and he was just to ask what had made such a ____ change when the parrot went on saying, "May I ask what the chicken in the fridge did?"