根据短文理解，完成下列各题。

Mum gives little Tom ten yuan. Then little Tom goes shopping. He gets on the bus and sits down next to an old woman. Then he sees the old woman's bag is open. There is ten yuan in it. He quickly looks into his pocket. The money isn't there now! Little Tom is sure that the old woman is a thief（小偷）. He decides（决定） to take back the money from the old woman's bag. So he carefully puts his hand into the old woman's bag, takes the money and says nothing. Suddenly（突然地） the old woman shouts, “Where is my money? I can't find it.There is a thief in the bus.” Little Tom feels strange（奇怪的）. Then he sees his own ten yuan under his seat. Little Tom is thinking a question now, “Am I a thief?”