Just then the police radio says there was a robbery  in a supermarket nearby. The police told Mr. Brown to stay there and they would be back soon. Then the police ran to the supermarket. Mr. Brown didn't wait but drove home. When he got home, he was tired and went to bed. Mrs. Brown found a police car in front of their house and the lights were still on. . Mr. Brown went home   _  .
on foot by car in his friend's car by taxi