water is covered （covering）about seventy percent of our earth用cover的哪种形式

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• water is covered （covering）about seventy percent of our earth
• water is covered （covering）about seventy percent of our earth用cover的哪种形式
• 请问为什么用covering ：seen from the moon,our earth ,with water covering_______ from the moon,our earth with water ______ twenty percent of its surface,appears as a blue ball.a.Seen,covered b.Seen,covering .第一空我懂 ,想知道cover为什么用ing ,不是被水覆盖的吗?
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• About——percent of the earth'ssurface is covered with water