Problem: How does the sentence end?

Performing karaoke in public suited Dennis but not Justin because
Answer: Justin had little talent and trained unsuccessfully.

Problem: How does the sentence end?

Benjamin hired Brett to restring and tune his new guitar because
Answer: Benjamin didn't know how to.

Problem: How does the sentence end?

The water in the cup still steam and James blew some air into it. The
Answer: air is cold.

Problem: How does the sentence end?

Natalie played a lot more hours of Minecraft then Cynthia did, so
Answer:
Natalie was able to make a lot of money on it.