五、Emma 和 Mike 在图书馆，他们发现一名小男孩在乱扔垃圾。请连词成句，使他们的对话完整。
Emma: Hello, Mike. 1.
What can you see near the window
(see, what, the, you, can, near, window)?
Mike: 2.
I can see a boy throwing paper on the floor
(I, paper, boy, see, throwing, on, can, floor, a, the).
Emma: Oh no! 3.
He should not throw rubbish on the floor
(he, throw, not, should, the, rubbish, floor, on).
Mike: Yes, you are right.
Emma: We should follow the library rules.
Mike: Of course! 4.
We will keep the library clean
(keep, clean, library, we, the, will).
Emma: He's making a mess now.
Mike: 5.
Let's go and stop him
(stop, him, let's, go, and).
Emma: OK!
