仔细阅读，用适当的词完成下列短文。 Once Einstein gave a lecture in many places in America. His driver always listened to him and knew the 1ecture so well that he was sure he could give it himself. So Einstein agreed that the driver gave the lecture for him. 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 quite easy and told the man to ask his driver behind to answer it. 根据短文内容填空，每空限填一词。 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 give the lecture for him that night. The driver gave a good lecture and the great scientist was quite pleased. When they were 3_________ the lecture room,a mall asked the driver a question. To show 4_________ easy the question was, the driver asked Einstein who followed him behind to answer it 5_________ of him.