Problem: How does the sentence end?

Rebecca's skin showed no signs of age, while Christine looked haggard, because 
Answer: Christine consumed lots of cigarettes.

Problem: How does the sentence end?

The large wooden cutting board did not fit into the kitchen sink because the 
Answer: cutting board was too large.

Problem: How does the sentence end?

I tried to convert my friend from an omnivore diet to a vegan diet because I think the 
Answer: omnivore diet is unethical.

Problem: How does the sentence end?

Christine was naturally tidy while Felicia was naturally messy. 
Answer:
Christine loved to sort laundry and clean the house.