Problem: How does the sentence end?

Betty was much more comfortable in her own skin than Angela was because 
Answer: Betty had great self awareness.

Problem: How does the sentence end?

Kenny used the bleach rather than the soap to remove the stains off the shirt. The 
Answer: soap was less concentrated.

Problem: How does the sentence end?

Jason was better at solving puzzles than William because 
Answer: William spent far less time practicing them at night.

Problem: How does the sentence end?

Christopher saved his money and didn't take risks but Nick like to spend all his and take many risks. 
Answer:
Christopher lived conservatively.