20. The news came as no surprise to me, for I _______of it earlier.

　A. hear　 B. heard　　C. had heard　 D. have heard

19. We’ll arrive in_______ European country in half ___________ hour.

　 　　 A. a; an　　　 B. an; an　　　　 C. a; a　　　　　 D. an; a