Problem: How does the sentence end?

The baby slept better in the crib by themselves than in the bed with their mother because there was less movement on the 
Answer: crib mattress.

Problem: How does the sentence end?

Monica hated giving speeches in school unlike Betty because 
Answer: Monica was a lot less confident.

Problem: How does the sentence end?

People like the concrete on the main street more than the stone on the side street, because the 
Answer: concrete is sturdy.

Problem: How does the sentence end?

The group blamed Christine for the mistake and not Laura because 
Answer:
Laura followed the rules.