Choose the best answer (根据短文内容，选择最恰当的答案)

John's room is on the first floor. Now he is in his room. He is sitting on the floor and playing with his model planes. There is a radio on the desk. It is on. John is listening to music. He likes pop songs. There is a knock at the door. John puts down the planes, gets up from the floor and goes to open the door. It's his mother, Mrs. Green. She comes to get a toy cat for Jenny, one of John's sisters. But where is it? There are many toys on the floor. John can not find the toy cat. Mother says, "John, you must keep your room clean and tidy. Now, clean the room. " John begins to clean the room. Oh, here it is. The toy cat is under the bed. It's between his shoes.