Problem: How does the sentence end?

Emily gave a donation to the shelter while Cynthia didn't, because 
Answer: Emily was very rich and caring.

Problem: How does the sentence end?

Nelson went to the doctors office without Dennis because 
Answer: Dennis had to change the engine oil.

Problem: How does the sentence end?

Michael made a dessert for Kevin, because 
Answer: Kevin wanted to taste something that was nice.

Problem: How does the sentence end?

Brian got a job working with dogs, while Derrick worked in sales because 
Answer:
Brian was an animal person.