第13页

信息发布者：

classroom

window

blackboard

chair

desk

our

keep

close

sweep

floor

let

us

dirty

clean

 put away the books

 sweep the floor

 close the door

 clean the desk and chair

—Let's clean our classroom! —Good idea!

—I can clean the blackboard. —Me too!

—Our classroom is clean now. — Yes. Let's keep it clean.