John moved into a new house. He was very happy. He had an old cat and a young cat. He liked them very much, He thought, "I must let my cat go in and out of my house when I'm not at home." He had an idea. One day, a friend came to see him and saw two holes  in his door. One is big, the other is small. "My dear friend," he said, "It's a very nice house, but why are two holes in your door of the new house?" "To let the cat in and out, of course." John said. "But why are there two holes? Is one hole all right?" "How can a big cat go through the little hole?" said John. "That's right. But can't a little cat go through  a big hole?" The friend laughed. John moved into a new house with   _  .
a cat two cats his friend two dogs