Problem: How does the sentence end?

The much needed supplies were bought by Donald but not Justin because 
Answer: Donald was a richer person.

Problem: How does the sentence end?

The playful kitten came bounding up to Craig but not Ian because 
Answer: Craig had a cat toy to play with.

Problem: How does the sentence end?

Ian climbed the tree but could not convince Steven to join because 
Answer: Steven was scared of heights.

Problem: How does the sentence end?

Emily can go a long time without visiting a bathroom but Jessica cannot because 
Answer:
Emily has a large bladder.