Problem: Mary was a very lonely person until they met Erin because

My choice: Erin had very many friends.

Problem: Matthew successfully found and caught the criminal in the act while Adam tried to escape because

My choice: Adam was a bad guy.

Problem: The candy broke apart easily with just a blow on it. The

My choice: blow is too strong.

Problem: The box could not stand on the edge like the pot did because the

My choice:
box is unbalanced.