John is a famous writer now. But he said he was not a ________ student when he was young. He was often late for ________ and didn't like doing his homework. Sometimes, he slept in class while the teacher was teaching. He didn't understand much, ________ he always thought he understood everything. One day the teacher ________ the students a question, "When Jack was ten years old, ________ brother Bob was twenty. Jack is fifteen now and ________ is his brother Bob?" John said, "That's easy. Bob is twice as old as Jack, so he is now thirty. "

Another time, the ________ in a science class asked, "When it thunders(打雷), ________ do we always see the light before we ________ the sound?" "But, Miss," said John quickly, "don't you ________ our eyes are in front of our ears?"

Suddenly the ice _______. One of the boys fell into the water. The children shouted，“Help! Help!” They didn’t know _______ to do. The two Canadian women heard _______ and skated over to get the boy out of the water.

The ice was _______. The two Canadians fell into the water, too. But they tried their best to _______ the little boy. They knew they must be _______. If they didn’t push him up onto the ice, he would soon die.

Many people ran over to _______ them. Some of them had ropes and poles. A young man jumped into the water to save the _______ people.

The boy and the two Canadian women were out of water at last. One of the women didn’t feel well. She was sent to the ________ at once. But she felt very happy because the boy was saved.