Problem: Justin started to push their belief on Robert against their will, because

My choice: Justin wanted to make a conversion.

Problem: The doctor sent Maria but not Sarah to the pharmacy because

My choice: Maria was very sick.

Problem: Nick thought role playing games were fun but Justin preferred shooter games.

My choice: Justin bought a Halo game.

Problem: Monica's passion for photography was a lot stronger than Samantha's because

My choice:
Samantha took pictures seldom.