The following story is for questions numbers 6-10.

New Hat

    One day, Daisy decided to buy Donald a new hat, ''Your hat is so old fashioned!" she said, "Come on, I'll buy a new one."

    Donald knew that Daisy was right, so he agreed to go to a hat shop. As she went in, Daisy took offhis old hat, "Hey, what's going on?" asked Donald. 

    "I'm taking off your old hat because it's so ugly, we don't want the assistant to see you wearing it, do we?" said Daisy. Donald just said, "Err... no... I mean, you're right, we don't."

    In fact, Donald was very fond of his old hat, although he didn't mind getting a new one if Daisy paid for it. The trouble was this: there wasn't any hat in the shop that Donald liked. He tried many hats, but he felt that all the hats looked silly on him.

    The shop assistant was getting tired of serving Donald, but he took another hat and showed it to him. ''What about this one, sir? I am sure you'll like it."

    "I quite agree!" said Donald happily. Do you know why? Because that hat looked exactly the same as his old one! Poor Daisy, she wasn't very happy, but she had to pay for that hat. She promised she would buy a new hat for Donald, didn't she?

What is the main idea of the passage?