1.   Doing well in exams is to some extent a matter of luck.

2.   Even this madness is also to a considerable extent a matter of performance, of enactment.

3.   Fossil discoveries are to some extent a matter of luck.

4.   The breakdown of public school athletics in New York City over the last quarter century was to a great extent a matter of impersonal forces and unintended consequences.

5.   The likely effect of biological agents remains to some extent a matter of conjecture because they have seldom been used in warfare.