四、根据情境，选择合适的句子。
()1. 朋友提醒你不要在图书馆里跑，你可以说：
A. I'm sorry.
B. You're welcome.
()2. 迈克迟到了，站在教室门口，老师说：
A. Don't be late again, Mike.
B. Clean the desk.
()3. 别人问你这是什么，你可以回答：
A. Yes, it is a ruler.
B. It's a ruler.
()4. 格林先生提醒你不要往窗外看，你说：
A. Yes, Mr Green.
B. Don't run.

四、1. A 2. A 3. B 4. A

五、根据图片选择合适的句子，补全对话。

A.I'm sorry, Mr Green.
B.Yes, Mr Liu.
C.Don't be late again.
D.Don't draw on your desk.

五、1. D 2. ①C；②A 3. B

六、根据上下文提示，补全对话。
Mike：Good morning, Su Hai!
Su Hai：1.
Mike：Let's make rules for our class!
Su Hai：2. What rules should we obey (遵守) in our class?
Mike：3. We can draw on some paper in the art class.
Su Hai：OK. 4. We should have classes on time.
Mike：OK. Let's follow the rules.
A. And don't be late.
B. Great!
C. Good morning, Mike.
D. Don't draw on the desk.

六、1. C 2. B 3. D 4. A