题目

It was a cool October evening. Excitement and family members __1___ the hall. I was only a 7-year-old girl, but I was the center of __2___. Finally, after weeks of preparation, I would __3_ all my hard work in a dance of performance. Everything would be __4___ —so I thought. I waited backstage all __5__ in my black tights with a golden belt. In a loud and clear voice, the master of ceremonies  __6__ that my class was next. My dance class was doing a routine on wooden boxes two feet by two feet, facing the  __7___. All I had to do in the next move was put one foot on the box next to 商场里向上运动的自动扶梯长12米，24秒钟可以把人送上楼．如果某人用1米/秒的速度沿这个扶梯走上楼，需要的时间是8s8s；如果用同样的速度沿这个扶梯走下楼，需要的时间是24s24s．