Problem: How does the sentence end?

The company hired Brian but not Neil for the accounting job because 
Answer: Neil was horrible with numbers.

Problem: How does the sentence end?

Derrick's ukulele playing sounded far worse than Leslie's performance for the reason that 
Answer: Derrick was an amateur at the instrument.

Problem: How does the sentence end?

William was trying to treat the ulcer of Benjamin at the hospital because 
Answer: Benjamin is a patient.

Problem: How does the sentence end?

Ian climbed the tree but could not convince Steven to join because 
Answer:
Steven was scared of heights.