题目内容：

短文改错

My cousin George and I went on a trip to my uncle last Sunday. We were riding along a hillside then suddenly some big stones were rolled down and knocked us off our bikes. George's legs got seriously injure and so did mine. We couldn't move a bit. Lucky, I saw some farmers ahead. Wave our hands, we cried for help like crazy. On hearing us, they run to the spot as fast as they could. Thanks to their help, we were all sent to a nearby hospital and received medical treatment on time. Although we do not know about their name, we feel they are like our dear big brothers and sisters.