辽和北宋被金国灭亡的共同原因是(   )

A．国家统治者不得人心

B．人民反对抗金

C．国家统治腐朽

D．国家内部发生分裂

We thought of selling this old furniture, but we've decided to          it. It might be valuable.      [ ]

A. hold on to                      

B. keep up with      

C. turn to                        

D. look after