看图短文填空。 (本大题有1 0小题，每小题1.5分，共15分)
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Bob and David are good friends, but they like to joke on each other sometimes. One day they went to London for their holidays. They went to the       and bought their tickets. When the train arrived, Bob got on the train first, but he dropped his____on the platform(站台) without knowing it. David was behind him and quickly_______it up. Without saying a word to his friend, he put it    his pocket.
After they had been in the____ for a little while, they saw the conductor (列车员)coming along, shouting, "Ticket, please!" Bob_______for his and of course he couldn't find it.
"Oh, dear, I can't _____my ticket, David, "he said. "Have another look, Bob ,it must be______, "said David. "No, I can't find it anywhere. What shall I do?"
"Perhaps you'd better hide under the_____so that the conductor won't see you. "
So Bob crawled (爬) under the seat and lay there quietly. Soon the conductor stood in front of David. "Ticket, please, "he said. David handed him        tickets and said, "This is mine. The other is my friend's. He prefers to travel under the seat. "