Problem: How does the sentence end?

Robert always got worse marks for behavior on report cards than Nick, because 
Answer: Nick obeyed the teacher's requests.

Problem: How does the sentence end?

When it comes to skateboarding, Elena is much better compared to Betty due to 
Answer: Betty being lazy.

Problem: How does the sentence end?

The songs sounded better in the hall than in the auditorium because the speakers in the 
Answer: auditorium were smaller.

Problem: How does the sentence end?

The guidelines at my old job were a lot worse than the instructions at my new job, because the 
Answer:
guidelines were stricter.