为什么填whereas far as i know,there have been few cases (where)

as far as I know As far As i know there are no man-made object as big as As far as I know,when and where to give the concert( ) yet. As you know,I have been passing away of love Where have you been there days?这里不是应用have been 为什么there前不加to 翻译but so far as i know,there is no concert held there this w do you have any question?可以回答 Not as far as I know. Mary __________ to know where you have been, as she has some I have been there as i konw等于as far as i know吗? Do you know where Tom is?Well,he ( )have gone far,his coat i I have been there （ ）（two) 括号里填什么