this is my backpack---------that is my pencil case中应填什么

this is my backpack---------that is my pencil case中应填什么 Is this my pencil case?回答 is,too,that,pencil,my,and) (is,case,yellow,this,a,pencil my pencil is ____ my pencil case 连词成句（is,too,that,pencil,my,and) (is,case,yellow,this,a,penci This is my pencil case.改为一般疑问句 This is my pencil case改为复数形式 This is my new pencil case 改为一般疑问句 This is my pencil case的同义ju That is my pencil case（改为一般疑问句） that is my a pencil case 哪里错了 This is ( ) pencil-case.( ) is in my bag.A.his;My B.my;Your