My mother had an accident last Thursday. She was trapped(被困于) in her c  for 20 minutes! It was a cold day. And the s  was heavy. She was driving home f  work at nine p.m. As there was snow on the road, She drove very slowly. But u  , the car broke down suddenly. She couldn’t s    it. And what was worse, she couldn’t open the door. She f  very helpless and didn’t know what to do. So she telephoned my father with her mobile. But my father happened to(碰巧) be in a   city. There were f    people on the road and the snow continued to fall around her car. She h    to call 110 for help. Two policemen a______ there soon. They tried many ways to open the door. And my mother came back home in their police car in the end. She gave us a surprise!.