布置教室 (a)   the classroom

整齐地排列 arranged (a)  

展开地毯 ____ ___ a carpet

(a)  

整齐干净 (a)   and neat

美化（动词）

(a)  

大扫除 (a)   cleaning

集合在礼堂 (a)   at the school hall

分工合作 worked (a)  

擦掉灰尘 ____ ___ the dust

(a)