Problem: How does the sentence end?

The bartender knocked over a glass that held a drink onto the bartop so the 
Answer: glass was empty.

Problem: How does the sentence end?

Christopher thinks mice are a good pet but Derrick does not. 
Answer: Christopher bought some mice at the pet store.

Problem: How does the sentence end?

The teacher found detention was a better discipline than suspension, as the 
Answer: detention was effective in improving behavior.

Problem: How does the sentence end?

Brett knew how to take care of a kitten better than Neil because 
Answer:
Brett was a cat person.