One day Mr. and Mrs. Green went shopping by car. They stopped their car near a shop. They bought many things from the shop and the things were very heavy. They wanted to put the things in their car. But Mr. Green couldn’t open the door of the car. "Let’s ask a policeman for help," said Mr. Green. They asked a policeman to help them. The policeman was very friendly to help them open tile door of the car, but he couldn’t open it, either. At that time a young man came and shouted," What are you doing with my car" Mr. Green looked at the number of the car. "Oh, dear! See what we’re doing!" Then said sorry to the young man. Mr. and Mrs. Green felt ______ when they couldn’t open the door of the car.