Problem: How does the sentence end?

So 
Answer: Eric wanted to be a bad person because Justin was taught to be good while Eric wasn't.

Problem: How does the sentence end?

Sandra uses a whisk to beat the scrambled eggs instead of an electric beater, because the 
Answer: beater left lumps in the eggs yesterday.

Problem: How does the sentence end?

Most authors published a book about romance rather than fantasy because the 
Answer: fantasy novels sold poorly.

Problem: How does the sentence end?

Matthew refused to cut the firewood like Donald asked even though 
Answer:
Donald was too busy to do it.