五、补全对话。
Lisa: Hi, Xinxin! I can't find my eraser. Can I use your eraser?
Xinxin: Sure. Here you are. And look! A blue one is under the desk. 1. ____
Lisa: No, it isn't.
Xinxin: 2. ____
Lisa: It's brown.
Xinxin: Brown? Look! 3. ____
Lisa: Oh! It's mine(我的)! Thank you!
Xinxin: 4. ____
A. A brown eraser is under your chair.
B. What colour is your eraser?
C. Is this your eraser?
D. You're welcome.

1. C；2. B；3. A；4. D