Problem: How does the sentence end?

Robert frequently tended to dominate the conversation with Aaron, because 
Answer: Robert ignored basic social cues.

Problem: How does the sentence end?

More children were playing checkers than were playing chess because the 
Answer: chess game was harder to learn.

Problem: How does the sentence end?

The dishwasher filled the machine with soap from the container until the 
Answer: container was empty.

Problem: How does the sentence end?

Benjamin asked Logan if he had checked the expiration date on the milk because 
Answer:
Benjamin hadn't looked.