I f什么 a book on the floor

I f什么 a book on the floor a book on the floor 和 a book is on the floor有什么区别? a book under the desk on the floor,on the floor修饰desk还是什么? She found a book ____(lie) on the floor. Whose is the book on the floor? knock off book on the floor还是knock over book on the floor what is on the floor?there is.A、a book and a baseball and so I bought a flat on the(第九)floor. i am looking for a flat on the ground floor the is a book shop ()the first floor 填on 还是in i have a book on the desk Peter lives on the ground floor and I live _ him.A.two floor