[Q]: How does the sentence end?

Kenneth paid more for their tattoo than Lawrence because the one on 

[A]: Lawrence was more plain.


[Q]: How does the sentence end?

Randy cooked noodles for a recipe and Michael did not because 

[A]: Michael was making hamburgers.


[Q]: How does the sentence end?

The book on lizards sold more copies than the one written on spiders. It's because the 

[A]:
spiders book was written in a boring style.