[Q]: How does the sentence end?

Joseph helped to prevent the disease in Brett's body during the overwhelming plague because

[A]: Joseph was a doctor.

[Q]: How does the sentence end?

Making soap was easy for Ryan but not Dennis because

[A]: Dennis did not have access to all the ingredients.

[Q]: How does the sentence end?

Matthew had dirtier hair than Adam did because

[A]:
Adam washed their hair almost every day.