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One morning, John left his house with six donkeys (驴) for the market. After a while, he got very ______ and got on one of them. Then he counted (点数) the donkeys, and there were only five, so he ______ off and went to look for the sixth. He looked and looked, but did not ______ it. So he went back to the donkeys and counted ______ again. This time there were six. He got on one of them, and they all ______.

After ______ minutes, he counted the donkeys again, and there were only five again. While he was counting, a friend of his ______ and John said to him, “I left my house ______ six donkeys, then, I had five, then, I had six again, and now I have only five! Look! One, two, three, four, five.” “But John,” said the friend. “You are ______ on a donkey! That is the sixth. You are the ______.”