根据短文内容，回答下列问题。

This is a picture of Anna's room. You can see some things in it. A white desk and a red bed are on the floor. Her schoolbag and pencil box are on the desk. You can see three English books on the desk, too. What is that under the desk? It's a baseball. Where is Anna's computer game? Oh, it's on the bed. You can see a red hat on the chair. It's not Anna's. It's her sister's. Where is Anna's sister? She is on the sofa.