George is a young man. He has a very big dog and he has a very small car, too. He likes playing basketball. Last Monday he played basketball for an hour at his club (俱乐部), and then he ran out and jumped into a car, but his dog jumped into the next one. "Come here, silly (傻的) dog George shouted at it. But the dog stayed in the other car. George put his key into the lock (锁) of the car, but the key did not work. Then he looked at the car again. It was not his! He was in the wrong car! And the dog was in the right one! "He’s sitting and laughing at me!" George said angrily. But then he smiled and got into his car with the dog.

George couldn’t tarn his key in the lock of the car because ______.