阅读下列短文，掌握其大意，然后从各题所给的三个或四个选项中，选出最佳选项。

An old man just went to visit his son and he was going back to his hometown by train. He was looking at the new shoes and he was very1because his son bought the shoes for him. 2one of the shoes dropped from the train by accident. The people around him all thought it was a3. So the people on the train all said to him，"Don't worry! It's only one shoe; you still have the other shoe. "But the old man4the other shoe out of the window. All people around him were surprised. The old man said with a smile，"Only one shoe is no5for me. But if some people find that pair of shoes，they can6them happily!"