1.   But certain individuals clearly played crucial roles and it meant names had to be mentioned.

2.   But recently it has been learned that adenosine plays a crucial role in setting the overall arousal level of the brain.

3.   In my view, scientists have a crucial role to play in the rapprochement of conventional and complementary medicine.

4.   Loading and storing the data Manchester Computing Centre has a crucial role to play in the care of the datasets.

5.   Might not some essential aspects of quantum theory also be playing crucial roles in the physics that underlies our thought processes?

6.   Migration plays a crucial role in maintaining the balance between population and resources.

7.   Notice the crucial role that prices play in this remarkable result.

8.   Parents play a crucial role in preparing their children for adult life.

9.   The headteacher has played a crucial role in transforming this school.

10.   The mutual recognition of ministers and members that is inherent in all union schemes plays a crucial role here.