Active Voice and Passive Voice :
You know that the earth __________(go) round the sun and the moon __________(go) round the earth. You know also perhaps that there __________(be) several other bodies which like the earth ________(go) round the sum. So the earth _________(start) to cool. It _______(take) long time over it. Gradually the surface of the earth _________(become) cooler although interior __________ (remain) very hot. When the earth (cool) all the water vapor in the air ___________(condense) into water and probably _____________(come) down as rain. It must ______________(rain) a tremendous lot them.
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