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Mark
Twain was a great American writer. He was very busy, so he often forgot
something.
One
day he went to a city by train. When he was in the train, the conductor(售票员)asked him for his ticket, but he couldn't find the ticket. The
conductor knew Mark Twain. She said, "Show me your ticket on your way back.
If you can't find it, it doesn't matter. "
"Oh,
no," said Mark Twain. "I must find the ticket. I can't find it, how
can I know where I'm going?"