Problem: How does the sentence end?

Singh drank a soda with caffeine to combat his tiredness but it didn't work because the 
Answer: tiredness was too strong.

Problem: How does the sentence end?

Carrie thought Samantha was a horrible driver because 
Answer: Carrie witnessed the multi-car pileup on the freeway.

Problem: How does the sentence end?

Michael had gotten a lot fewer broken bones throughout his life compared to Ian, therefore 
Answer: Ian had more scars.

Problem: How does the sentence end?

Leslie got a better grade on their English paper than Eric, because 
Answer:
Leslie chose a topic that was less repetitive.