Einstein often ______ invitations to explain his theories(学说) at different universities. On these trips, his driver Hans often said to him, “It’s a pleasure to drive a genius like you, Dr Einstein.”

One evening, on their way to a university, Einstein said, “I’m so ______. I wish I could avoid(避免) giving my lecture tonight, Hans, but I don’t want to let my audience ______.”

“I know what to do,” said Hans. “I can give the lecture for you. You can ______ me. I’ve listened to your lecture so many times that I’ve learnt it by heart. ______ knows you at this university, so they won’t find out.”

So, they changed places. At the university, Hans was ______ the front of the hall. Einstein took a seat, listened to Hans give his lecture without difficulty, and joined in the applause at the end.

______, before Hans left, a man shouted, “I’d like to ask you a question.” He then asked a question so ______ that Hans had no idea what he was talking about.

Einstein turned pale. “Oh no!” he thought. “Now we’re in trouble.” But Hans just______ and said, “That’s such an easy question that even my driver can answer it. Hans, please…”

Einstein stood up and answered the question perfectly.

They left the university, with Einstein driving. A little later, Hans offered to drive. “No,” laughed Einstein. “It’s a pleasure to drive a ______ like you, Hans.”