用所给动词的适当形式填空，完成下面对话。

Marie: Hello! May I speak to Karen?

Karen: Hello! This is Karen. How are you, Marie?

Marie: I'm fine. What (be) you (do) now?

Karen: I (study) science. What about you?

Marie: I (clean) my room.

Karen: Hey, do you want to go to the cinema?

Marie: That sounds boring.

Karen: I (call) Lucy just now. She (swim) this afternoon. Do you like swimming?

Marie: Sure. Why not go with her?

Karen: That's a good idea!