关于购物的英语小谜语，笑话或者故事，初中生的，谢谢

A Difficult Question
Four girls went to school every day by taxi.
One day one of the girls said,"There's a test this morning .Let's get to school late.Then we won'have to take the test."
"What can we tell the teacher?"one of the girls said."He'll be angry. We'll need a good excuse."
The girls thought for several moments,then one of them said,"Let's tell him that our taxi had a flat tire."
"That's a good idea,"the other girls said."We'll tell him that."
"Why are you late?"the teacher asked."You missed the test."
"Our taxi had a flat tire,"one of the girls said.
The teacher thought for a moment,then he said,"Sit down,one of you in each corner of the room."
The four girls did this.
then the teacher said,"Write on a piece of paper the answer to this question:Which tire was flat?"