Whose book is this -- It must belong _

Whose book is this -- It must belong _ Whose on earth is this book?Doesn't it belong to anybody her -Whose book is this?-It must __ Mary.I saw her read it this Whose book is this,It’s _.My parents bought it for my sister --Whose notebook is this? --It must be______. whose book is this?It's( ). whose is this book? Whose book is this? Whose book is this?It's_____.A.mine B whose book is this?it's mike's.please______ Whose Frebch book is this?It could be_______(Ali) Whose book is this? It( )our geography teacher's.