Problem: How does the sentence end?

I'm not sure if there is a greater chance of tap or bottle water being bad for you, but I prefer the 
Answer: tap because it comes from my home.

Problem: How does the sentence end?

His injury is a lot worse than her scratch because the 
Answer: injury is from a horrible accident.

Problem: How does the sentence end?

Robert has a much harder time managing the heat than Samuel because 
Answer: Robert lives in Russia.

Problem: How does the sentence end?

Because Felicia had less willpower than Amy, it was easier for 
Answer:
Amy to stick to her diet she wanted to follow.