Having prepared himself well for the realtor exams and having exhausted everyone in the family with his requests that someone help him with the true-and-false drills, Jeffrey, who had never been a particularly good student in high school, knew he was ready to take on the greatest challenge of his life.

Coins were minted of precious metals the religious overtones of money were then strengthened.

Marcellino always knew his way around the woods this is something he could always depend on.

Throughout history money and religion were closely linked there was little distinction between government and religion.

Which run-on sentence correction is NOT correct?

Jeffrey, who had never been a particularly good student in high school, knew he was ready to take on the greatest challenge of his life.

The results of the study were inconclusive, therefore more research needs to be done on the topic.

Refer to the section in red:

When I got there, I had to wait forever to see him when he finally examined my teeth, he found four cavities.

Which is NOT an acceptable way to fix the following sentence:

Since four inches snow have fallen, school has been closed the children are all outside having a snowball fight.