Problem: How does the sentence end?

Joseph prepared the food in the frying pan while Nick did the dishes, and
Answer: Joseph cooked the potatoes thoroughly.

Problem: How does the sentence end?

The toilet clogged easily but the sink rarely did, as the
Answer: toilet was really old.

Problem: How does the sentence end?

Betty loved to travel while Natalie had never left their hometown. although
Answer: Natalie wanted to visited the White House in Washington DC.

Problem: How does the sentence end?

Mary replaced the old photo book with a digital frame for Christmas last year, the
Answer:
photo book was old.