根据短文内容，完成下列短文。每空一词。

     Once Einstein gave a lecture in many places in America. His driver always listened to him and knew

the lecture so well that he was sure he could give it himself. So Einstein agreed that the driver gave the

lecture himself.

     As nobody knew Einstein there, the driver gave the lecture for Einstein that evening. At first he was a

bit afraid, but Einstein's smile made him feel better. He gave a good lecture and the people were quite

pleased.

     Then the driver started to leave and Einstein followed him without a word. When they got to the

door, a man asked the driver a difficult question.

     The driver said that the question was very easy, and told the man to ask his driver behind to answer it.

Einstein gave the __1_    lecture again and again.  His driver listened to his lecture so many times that he

wanted to give it __2_    . When Einstein knew it, he let the driver     3      the lecture for him that night.

The driver gave a good lecture and the great scientist was quite pleased. When they were __4_     the

lecture room,  a man asked the driver a question.  To show how easy the question was, the driver asked

Einstein who followed him to answer it 

    5      him.