--- How do you find your missing pen?

--- Wow. _______________.

A．It writes well                           B．Quite by accident

C．It lies on my desk                        D．It was kept by my grandfather

—How do you find your missing pen?

—Wow,         .

A．It writes well                                              B．Quite by chance

C．It lies in my drawer                                     D．It was kept by my grandfather