Your clasemate is a boy ,isn't it?该句中“it”应用it还是he?

Your clasemate is a boy ,isn't it?该句中“it”应用it还是he? your friendship is a is your character a female? Is your character a girl? is your friend a girl? is your mother a policewoman? Is your mother a nurse? a cousin is your ( )child Your lover is a Chinese? What is your name a Is your rubber a heart? Is your rubber a heart? Is your brother a (drive) ( ) is your friend?He is a policman. where is your a book is? Is your mother a teacher () a doctor? A Dream is a wish your heart is your brother is有Is your brother is a teacher?这种说法吗