简单问候语Hello/Goodbye — 英语阅读题

阅读下面的英语短文，回答问题。 It is Monday morning. Kitty walks to school. At the school gate, she meets her friend Alice. Alice says, "Hello, Kitty! How are you?" Kitty smiles and says, "Hello, Alice! I'm fine, thank you. " They walk into the classroom together. In the afternoon, school is over. Kitty must go home now. She waves her hand and says to Alice, "Goodbye, Alice! See you tomorrow!" Alice waves too and says, "Goodbye!" Question: What does Kitty say to Alice when school is over in the afternoon?