根据短文内容。

It's Sunday today. I don't go to school. My father and mother don't go to work.  We are all at home. We are busy now. We are cleaning our house. Look! My father is sweeping the floor. My mother is cleaning the windows. I'm cleaning the desk. What's Mimi doing? Oh, she's playing with a ball. She's my lovely cat. We're tired, but we're happy.