根据下列短文内容，在短文后的空格处填上一个恰当的词，使短文完整、通顺。
It was a very cold morning. Some children were 1 on the ice. It was snowing 2 , but they
enjoyed 3 there. Mike, a tall boy, skated fast and he didn't see that there was a 4 in the ice. He
5 into the water. The other children called out 6 for help. Just then, a young man 7 quickly.
He 8 into the water without 9 off his clothes. Mike was 10 .
