学进去

An old man sat on a train. He was on his way home after he ________ his son working in a big city. He was looking at the new shoes happily because his son bought them for him. Suddenly, one of the shoes fell out of the window of the ________ by accident. The people around him all were ________ for him and they said to him, “Don’t worry! It’s only a shoe. You still have a shoe.” But to their surprise, the old man threw the other ________ out of the window. A woman asked, “Why? It’s new.” The old man said with a smile, “Only one shoe is no use for me. But if anyone finds that pair of shoes, he can ________ them happily.”