Problem: How does the sentence end?

The boy tried to focus his attention to watch the movie but the 
Answer: movie was too long.

Problem: How does the sentence end?

It was difficult for Carrie to control anger at bad drivers but Laura found it easy. 
Answer: Laura had always had a calm demeanor.

Problem: How does the sentence end?

The parents of Joel forgot to pick them up from school but the parents of Eric were on time. 
Answer: Joel was standing alone at the school.

Problem: How does the sentence end?

Craig had difficulty meeting new people while Kenneth did not so 
Answer:
Kenneth was welcoming when they introduced themselves to the other.