阅读对话，在表格中的相应位置打"√"。

Mengmeng: Let's clean our classroom!

Boys＆Girls: OK!

Mengmeng: Let me clean the door.

Lucy: Let me clean the blackboard.

David: Let me clean the teacher's desk.

Lily＆Sam: Let's clean the chairs and desks.

Who
Lucy
David
Lily
Mengmeng
Sam