It's the day before Christmas. Karen Hartley, 33, was skiing(滑雪) by1at Powder Mountain in Utah. By mistake, she began to ski off the trail. Soon she2. She shouted for help, but no one heard her. Night came, and the temperature3below freezing(冰点). Karen was very cold and afraid of4. But she stayed calm. She played music in her mind and danced all night long to stay5. She danced to old disco songs，pop songs, and Christmas songs. "It was either dance6die," she said. "I kept on7.I didn't give up."

    The next morning, a helicopter began to8Karen. After 18 hours in the cold, she was9just before it's too late. Karen was very cold but all right. She10Christmas Day in a hot tub(浴缸).