聽錄音，把空缺的地方補充完整。
It's ___________ in the afternoon. It's time to go ___________. But we must clean
our ___________. There are six ___________ in our group. Look! Liu Yong is carrying
some ___________ onto the desks. I'm carrying ___________. And the other is cleaning the
___________. At last, our classroom is very clean.
