Albert Einstein is a genius（天才）． This story about him shows that he's also humorous．
Einstein often received（1） （ invite） to explain his ideas 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（2） university， Einstein said，"I'm so tired． I wish I could avoid giving my lecture（讲座） tonight， Hans， but I don't want to make my listeners（3） （ disappoint）．"
"I know what to do，" said Hans．"I can give the lecture for you． You can trust（4） __ （ I）．I've listened to your lecture so many times that I've learn it by heart． No one（5） __ （ know）you at this university， so they won't find out． "
So， they changed places． At the university， Hans was（6） （ lead） to the front of the hall．Einstein took a seat， listened to Hans give his lecture（7） difficulty， and joined in the applause（掌声） at the end．
However， before Hans left， a man shouted，"I'd like（8） （ ask ）you a question． "He then asked a question so difficult that Hans had no idea what he was talking about．
Einstein turned pale． "Oh no!"he thought． "Now we're in trouble． "（9） Hans just laughed and said，"That's such an easy question that even my driver can answer it． Hans， please…"Einstein stood up and answered the question（10） （ perfect）．
They left the university， with Einstein driving． A little later， Hans offered to drive．"No．"laughed Einstein． "It's a pleasure to drive a genius like you， Hans．"