四、给下列句子排序，组成一段通顺的对话。
A. Me too. Let's clean the chairs too.
B. Look. Our classroom is dirty. Let's clean it.
C. All right.
D. Good idea! I can clean the desks.
E. Thanks, Liu Tao. Our classroom is clean now.
F. Please close the window, Liu Tao.

B→D→A→C→F→E

根据对话逻辑排序：首先用B句提出教室脏了，提议打扫；接着D句赞同并说明自己要擦桌子；然后A句表示也要帮忙，提议擦椅子；C句回应同意；之后F句提出让刘涛关窗户；最后E句表达感谢并说明教室现在干净了。

五、选择方框内合适的句子完成对话，填序号。
Miss Li: School is over. Let's clean
our classroom.
All: OK, Miss Li.
Mike: The floor is dirty.
Liu Tao: OK.
Miss Li: Please clean the desks,
Su Hai.
Su Hai:
Yang Ling: The books are messy凌乱的.
Miss Li: Wow! Let's keep it clean and nice.
A. I can clean the blackboard
too.
B. Our classroom is clean
now.
C. Let's sweep the floor,
Liu Tao.
D. All right.
E. Let me put them away.

C；A；D；E；B

结合对话语境和选项意思进行匹配：
1. Mike说地板脏了，对应的提议是“Let's sweep the floor, Liu Tao.”，选C；
2. Liu Tao答应扫地后补充自己还能擦黑板，选A；
3. Su Hai回应李老师让擦桌子的指令，用“All right.”，选D；
4. Yang Ling说书很凌乱，对应的动作是把书收好，选E；
5. 打扫完成后李老师感叹教室变干净了，选B。