她在湿滑的地板上滑倒，脸朝下摔倒了。

She slipped on the wet floor and ___fell ___flat ___on her ___face.

他被一块石头绊倒，脸朝下摔在泥里。

He tripped over a rock and ___fell ___flat ___on his ___face in the mud.

如果你跑得太快，可能会脸朝下摔倒。

If you run too fast, you might ___fall ___flat ___on ___your ___face.