I don't know which toy to buy because there are so many to choose改错此句错在哪?

I don't know which dress (wear) I don't know which sportswoman I should support同义句:I don't know( )( )( )( ). I don't know. I don't know which sportswoman I should suI don't know which sportswoman I should suport.=I don't know ( ) ( ) ( ) ( ). I don't know which sweater _____(choose) I don,t know which one _____ （choose) i don't know choose which one为什么不对?谢谢 I really don't know which one to choose I don't know which watch _____(choose). I don't know which bus____(go) to station? 英语：I don'T know which one_____(choose)I don'T know which one_____(choose)再帮忙说一下为什么. 是I don't know which one is your father还是I don't know which one your father is “i don't know you know i don't know i don't know which shirt i should buy的同义句 要以I don't know开头 I don't know which sweater to choose.改为同义句I don't know ( )( )( )( ).是五个空 sorry,I don't know. i don`t know much I don't really know.