Tìm lỗi sai và sửa

I remember a trip I once 1 made to my grandmother's house. She 2 would live about 30 kilometres away from us and we 3 used to going there quite often with our mother. On this occasion we 4 set off to my grandmother's after school on a cold winter's day. When we were about to leave we 5 were noticing that some snow was beginning to fall, and as we 6 were driving along we 7 were realising that it 8 snowed more and more heavily. Suddenly we had to brake hard as the car in front stopped suddenly. We 9 were skidding and 10 went off the road into a ditch! It was pretty scary, but we were lucky and none of us were hurt. We got out of the car, and my mother 11 was phoning for help on her mobile phone. While we 12 were waiting for help it 13 was stopping snowing and we 14 sang lots of songs to keep ourselves cheerful. Eventually the truck 15 was coming and pulled our car out of the ditch. The car wasn't badly damaged, but we 16 decided to turn round and go home. We didn't manage to see our grandmother that day, but it was so frightening that I will never forget it.

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