选择合适的词填在横线上。 [[QOrDeR]]It is _______ pen. (my / mine) 【小题2】The cakes are _______. (him / his) 【小题3】Those are _______ boxes. (their / theirs) 【小题4】The desks are _______. (our / ours)(our / ours) 【小题5】This is your cap. That cap is _______. (her / hers)