完形填空

　　David received a parrot for his birthday.The parrot had a poor vocabulary(词汇量)，and many were not polite.David tried hard to 1 the bird's words and was often 2 ndline　 polite words，playing soft music，trying anything he could 3 ndline　 to set a good example.But nothing 4 ndline　 .He shouted at the bird and the bird just got angry and became even 5 ndline.Finally，with-out any hope，David put the 6　 in the freezer.For a few moments he heard the bird kick(踢) and cry loudly in it.Then suddenly it was 7 ndline　 梟ot a sound for half a minute.David was 8 ndline　 that he might have hurt the bird and quickly 9　 the freezer door.The parrot quietly 10　 out onto David's arm and said，“I 11 that I may have made you angry 12 me about my impolite language and actions.I will try my best at once to be polite.I am 13 sorry and beg your pardon.”

　　David was surprised at the bird's change，and he was just 14 ndline　 what had made such a surprising change when the parrot 15 ndline　

saying，“May I ask what the chicken in the freezer did?”

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