阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

A

    There were many people on a bus. An old man (look) here and there. He wanted to find  empty seat. Then he saw one and went to it. A small bag was on the seat. And a young man was beside it.

    "Is this seat empty?" asked the old man.

    "No, it's  an old woman. She went to buy some bananas.” said the young man.

    "Well, let me sit here, please. I'll leave here when she (come) back, "replied the old man.

    After a few minutes, the bus started. "The old woman (not come), but her bag is here. Let me give her the bag. "Then the old man threw the bag out of the bus window.

    The young man jumped up and shouted, "Don't throw! It's my bag!"