Mike is a football fan. There is a football match between Chinese team and American team. He wants to watch it. He comes to the box office and gives the clerk 10 yuan. The clerk says, “Please give me another 10 yuan. The price of a ticket is 20 yuan.”

    “Why?” says Mike, “I just watch Chinese team. I don't want to watch the other team at all. Do you want me to buy a ticket for it?No, no, no...”