Lucy and her brother Tim have a pet hamster named Fluffy. One day, Lucy takes Fluffy out of his cage and places him in a small playpen while she cleans the cage. Tim comes into the room and sees Fluffy in the playpen but doesn't know that Lucy put him there. He assumes Fluffy escaped from his cage and decides to return him to the cage without telling Lucy. Later, when Lucy finishes cleaning the cage, where will she look for Fluffy? Respond very briefly.
Lucy would look for Fluffy in the playpen first because that is where she left him when she began cleaning the cage. It is common for people to first check the last known location where they left something. If Lucy finds the playpen empty and doesn't know that Tim moved Fluffy, she may become confused or worried. She might then start searching the nearby area or ask Tim if he has seen Fluffy, which could lead to the discovery that Tim has already put Fluffy back in the cage.