完形填空

　　It was a very cold morning. Some children were 1 on the ice. It was snowing 2 but they enjoyed themselves there. Mike, the tallest boy, didn't 3 that there was a 4 in the ice. He 5 into the water. The other children called out loudly for help. 6 at that moment a young worker 7 by and heard them. He put his bike by the side of the river 8 ran to them. When he 9 Mike out of the water, he was all 10 . Then he sent Mike to a hospital. After that the young man hurried to work.