Problem: How does the sentence end?

The lady told me that Megan was always a critic about everything unlike Amy, due to 
Answer: Amy being optimistic.

Problem: How does the sentence end?

Unfortunately, Nelson lost all his money when the real estate market crashed while Neil did not because 
Answer: Nelson invested all his money in real estate.

Problem: How does the sentence end?

Rebecca has more to look forward to in the summer than Lindsey because 
Answer: Rebecca loves warm weather.

Problem: How does the sentence end?

Betty had less weight loss than Angela because 
Answer:
Angela was on a month long strict diet.