our teacher told us water ___(cover)most of the earth.正确形式填空

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• our teacher told us water ___(cover)most of the earth.正确形式填空
• our teacher told us water ___(cover)most of the earth.正确形式填空
• most of our earth----covered by water[be]横线上填were吗
• About seventy per cent of our earth( )by water Ais covering Bis covered Care covered Dare covering