Problem: How does the sentence end?

The man bought some yarn instead of a ball because his cat preferred playing with the 
Answer: yarn .

Problem: How does the sentence end?

William could only climb beginner walls while Jason climbed advanced ones because 
Answer: Jason was very strong.

Problem: How does the sentence end?

Jeffrey buys a live Christmas tree, while Hunter uses a fake one, so 
Answer: Jeffrey has to water his tree.

Problem: How does the sentence end?

Kenneth couldn't find a clean pair of underwear, so he took one from Joseph, so 
Answer:
Kenneth was able to get dressed on time.