20. - I’m sure Andrew will win the first prize in the final.

- I think so. He ____ for it for months. 　

A. is preparing 　B. was preparing　　　 C. had been preparing　 D. has been preparing

19. He hurried to the station only ______ that the train had left.

　　 A. to find　　 B. finding　　　 C. found　　　 D. to have found

18. The murderer was brought in, with his hands _____behind his back.

A. being tied　 B. having tied　 C. to be tied　 D. tied

17. Suddenly ,a tall man ______ the girl and took her away, ____ in to the woods.

A. seizing. disappeared　 B. seized, disappeared　

C. seizing, disappearing　 D seized, disappearing