Problem: How does the sentence end?

Katrina borrowed a ladder from Laura to put up Christmas lights; when the ladder broke, 
Answer: Katrina decided to buy their own.

Problem: How does the sentence end?

I donated my dining room table and my sofa to charity, but they declined the 
Answer: table because it was too uneven.

Problem: How does the sentence end?

Christopher had a very obnoxious personality that people did not like but Derrick was pleasant, 
Answer: Derrick had many friends.

Problem: How does the sentence end?

Joseph was helping Logan plant their new hydrangeas because 
Answer:
Logan extremely allergic to their touch.