19. It took us one year ________ the bridge.

A. build                  B. building               C. to build              D. to building

18. Jim is a ________ student.

A. 16 years old                                    B. 16 year old

C. 16 - years - old                                   D. 16 - year - old

17. There is a railroad ________ train between Dezhou and Jinan.

A. of                    B. for                   C. about                D. on