Problem: How does the sentence end?

The sink looked moldy, but the bathtub was sparkling, because John had neglected the
Answer: sink .

Problem: How does the sentence end?

Jan saw dolphins up close but not whales on her harbor cruise, because the
Answer: dolphins swam near the ship.

Problem: How does the sentence end?

The musician wanted to create the optimal sound and picked the guitar but not the piano because the
Answer: piano was out of place.

Problem: How does the sentence end?

Megan loves grilling steaks but Patricia is a vegetarian.
Answer:
Patricia won't eat any of the steak.