None of us knows whether these new parts can be bought中的boug

None of us knows （）these new parts can be bought.括号中可以填什么及为什 None of us can be sure___ aliens really exist----填that还是. None of us is perpect,nor can we ever be perfect翻译成中文是什么意思 None of us can live without air. 为什么不能写None of us can live n ————knows about it.用 nobody 还是none of us 3Q can,none,of,afford,us,car,this连词成句 we ____ our new English teacher yet,so none of us us know wh None of us new what had happened_____they told us about it.A I ( )a new dictionary.It is very useful.A.bought B.have boug None of us is perfect. none of these would be of any use unless there was a market怎 Different kinds of things can be bought there.是什么意思?