Earth is the only planet we know of that has life.

Earth is the only planet we know of that has life. As we all know,the earth is a planet almost covered by water We know (that) the earth is not round We know the earth (tha We all know that threty percent of the earth's surface is co We all know that the earth is round. 英语：we are certain the earth is the only one on which life ca That is only the first song we know Life on the planet is born of woman. 英语翻译Environment is the earth,the only planet and home for th The earth is the third planet. it is the only planet whose surface can be seen （）earth.用on和 The earth is a h----- blue planet