[Q]: How does the sentence end?

Joseph was assisting the roofing project while Neil was leading so 

[A]: Joseph did the physical labor.


[Q]: How does the sentence end?

Nick has learned to develop photos by themselves but Donald has not because 

[A]: Nick finds photography fascinating.


[Q]: How does the sentence end?

Tanya has very curly hair, Rachel has very straight hair so 

[A]:
Tanya has lots of curls.