1.   A comparison of these studies illustrates clearly their various contributions to the study social movements.

2.   All of you can make a significant contribution to the organization.

3.   Already the computer has made a significant contribution to the processing of much of the routine data generated by office staff.

4.   And he recognises that motorcycles can make a real contribution to reducing congestion.

5.   As such, a career in local government offers a challenge and opportunity to make a positive contribution to society.

6.   Austin agreed and I began work on my first, very modest contribution to deep-sea research.