改错题
Last Sunday morning when I got up, to me great surprise, 【M1】______ I found that we had a big snowfall. I was very excited because 【M2】______ it was a long time that I had ever seen such a heavy snowfall. 【M3】______ So I decided to call my friends to go out to play snow together. 【M4】______ We made up some snowmen and rolled some snowballs 【M5】______ and we enjoyed the fun of playing fighting games. Just then 【M6】______ we noticed that the buses and cars move very slowly 【M7】______ because the heavy snow. So we went to clean the snow so as to 【M8】______ help the traffic go safely. After the all morning's hard work, 【M9】______ we cleaned the snows on the road, and we went home happily. 【M10】______