What size are your father's____(foot)?

What size are your father's____(foot)? What size are your ()(foot)? 改错:What size are your foot? 改错 What size are your foot?I am Size Eight. what size are your ( ) What s____ are your feet? What size are your feet?I_____ What size are your“ ”（脚） Tom? what's your size 换一种说法 what size are you fit?what sizes are what size are are your shoes?该怎麽会答? ()are your feet?I am size eight.a:what.b:how big.c:what size what size are they/is it和what's your size可以互换吗