It ( ) this cap is lucy's

It ( ) this cap is lucy's WHOSE CAP IS THIS,---- IT' S ____ (MS SMART) 把以下每句变复数 Is this your cap ,jane?No.it's not mine .Whose cap 对应词填空This is a boy's cap.It's not a ___ one. This ruler is Lucy’s .Please give it to（）. This is lucy's bike --whose watch is this ?---【 】,回答为什么不能是this is lucy‘s 而是it is It is Lucy's dictionary. is this hers cap? --Who's this?--( ) is Lucy.下面四项选什么?为什么?This/It/That/She this is Jane's cap.my cap is on the bed改为同一句 1.This is Lucy's book.please give( ).A.back it for her B.it