Problem: How does the sentence end?

The decision making skills of Donald are poor when compared to those of Nelson. 
Answer: Donald is a horrible negotiator.

Problem: How does the sentence end?

While celebrating Rachel's birthday, Rebecca drank tequila because 
Answer: Rebecca was not pregnant and could drink alcohol.

Problem: How does the sentence end?

Donald never understood accounting, but Ryan knew everything about it, so the business of 
Answer: Donald failed to be profitable.

Problem: How does the sentence end?

Brett owed a lot of money to Nelson after 
Answer:
Brett borrowed a large sum of cash.