橡皮擦在哪里？（判断句子正误）
Tom: I want to find my eraser, please.
Lily: Look! There is an eraser on the window sill (窗台). Is this your eraser?
Tom: No, it isn’t.
Lily: Wait, there is an eraser in the pencil holder (笔筒). Is that your eraser?
Tom: Yes, it is. Thank you!