—Are those his books?
—Yes, __________.
My sister ____ (be) a singer since she left the school.
“文武将吏,擅自署置,贡赋不入于朝廷。虽称藩臣,实非王臣也。”引自《旧唐书》中的这则材料实质上反映了专制主义中央集权制度下( )
You can call us ________67654321 _______help.