阅读广角。(8分)
Ann：Our classroom is not clean.
David：Yes.Let's clean the classroom.
Li Ming：OK.Let me clean the window.
Liu Xin：Let me clean the board and sweep the floor.
David：Hi，Ann！Let's clean the desks and chairs.
Ann：Good idea！

Let's clean the classroom.
	floor	desks and chairs	board	window
Ann		√
Li Ming
Liu Xin
David