41.   A study has linked ill health in the area with industrial pollution.

42.   A study involving long-distance runners is being done at the Medical Center.

43.   A study of deductive reasoning constitutes the discipline of logic.

44.   A study of hospital administrators found that it took individuals eighteen months before they felt comfortable in that far less demanding role.

45.   A study of the two groups of students showed a significant difference.

46.   A study of these emendations reveals countless examples of the replacement of one stylistic variant by another.