---What is our earth like ________from the moon? ---Well, our earth, with water ________ 70% of its surface, appears as a "blue ball".
The man is standing _______ his back _______ the fire.
I don’t want to _______ money on such books.
He had ______ in finding Mr. Green’s house.
——Who telephoned just now? ——Sorry. I couldn’t ______ the voice.
Only when ______ in 1918, ______ happily back to work.