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

     — Good-bye.   

A. ring back    B. ring up    C. hold on     D. ring off

. — 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.   

-- I’d better ________ now. The water is boiling in the kitchen.

　 --- Good-bye.

A. ring back　　　　　　　　　　

B. ring up

C. hold on　　　　　　　　　　　

D. ring off

 — 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