Hello! My name's Mary Brown. I'm a girl. I like red. I have a red schoolbag. What's this? It's my red pencil box. Is that my ruler? Yes, it is. It is a red ruler. What's that? It is a watch. Is it my watch? No, it isn't. It's Bob's watch. It's blue. What color is the watch? It's   _  .
red blue brown yellow