Problem: How does the sentence end?

The doctor tried to cure the disease with the medicine but the 
Answer: disease was too strong.

Problem: How does the sentence end?

Christine was able to lose more weight than Laura because 
Answer: Christine ate a lot of healthy food.

Problem: How does the sentence end?

Justin easily defeated Logan in the contest, because 
Answer: Logan was so poorly prepared for it.

Problem: How does the sentence end?

In a quid pro quo, Elena did both their taxes while Natalie did both their haircuts. 
Answer:
Elena is an accountant.