Problem: How does the sentence end?

My cousin was not able to put the cases on the shelves, because the
Answer: shelves were too weak.

Problem: How does the sentence end?

Donald had light skin that would blister in the sun but Christopher didn't, therefore
Answer: Donald needed a high SPF lotion.

Problem: How does the sentence end?

Going to a rehab facility was necessary for Katrina but not Mary because
Answer: Katrina drank too much alcohol.

Problem: How does the sentence end?

Jessica fell down and hit her head, Patricia did not therefore
Answer:
Jessica had a swelling bumb on her head.