As we all know,waste water and gas______(对...有不良影响）the envir

As we all know,waste water and gas______(对...有不良影响）the envir As we all know,the earth is a planet almost covered by water 选择as we all know, two thirds of the earth's surface is water we all know the truth()there are air,water and sunlight ther As we all know,we get light and ___from the sun.(hot) as we all know . As we all know that the eyes are very important for us and i we all know that there no c() in the water we all know that we should not waste time 关于as引导从句1）As we all know,the earth is round.as是介词,有 正如.的意思.2 as we all know是什么意思 as we all know it