Problem: How does the sentence end?

Her grandmother's iron made a great substitution for the doorstop, because the 
Answer: iron was heavy.

Problem: How does the sentence end?

Growing hibiscus suited Jeffrey but not Robert because 
Answer: Robert had no knowledge of growing things.

Problem: How does the sentence end?

Patricia refused to give their phone number to Lindsey for the reason that 
Answer: Lindsey was not liked by them very much.

Problem: How does the sentence end?

Kevin earned a higher grade on the essay than Jason because 
Answer:
Kevin included a properly formatted bilbiography.