The dogsled race was about to begin. Julie's team of dogs was lined up at the starting gate. Julie stood behind them. The air was so cold that she could see her breath. Other teams were lined up, too, and the dogs were excited. Julie kept her eyes on the clock. At exactly ten o'clock, she and the other racers yelled, "Mush!" The dogs knew that meant "Go!" They leapt forward and the race began!