--David, are you 1istening to me?

--Sorry, Dad. I _______ to make sense of what the reporter said.

A．was trying

B．have tried

C．am trying

D．tried

—Good news!  Bill won ________ medal in the long jump just now.

—Really? That's his ________one at our sports meet-ing.   [ ]

A. a; four      

B. an; fourth      

C. a; fourth