从方框中选出合适答语

31．Thanks a lot．　　

32．When was the zipper invented？　　

33．Don't take photos in the museum．　　

34．Who's that speaking？　　

35．I won the first prize in the competition．　　

A．This is Mary speaking． B．You did a good job． C．It's a pleasure． D．It was invented in 1893． E．Sorry，I won't do it again． F．Good luck