— I’d better__________ now．The water is boiling in the kitchen．

   — Good-bye．

       A．ring off            B．ring up            C．ring in               D．ring back

．— I’d better__________ now．The water is boiling in the kitchen．

   — Good-bye．

       A．ring off        B．ring up        C．ring in    D．ring back

. — I’d better ____ now. The water is boiling in the kitchen.

— Good-bye.   

. — I’d better ____ now. The water is boiling in the kitchen.
— Good-bye.