[Q]: How does the sentence end?

Jake replaced his metal bike for a carbon one because the 

[A]: carbon was very lightweight.


[Q]: How does the sentence end?

Donald sat on the porch steps and watched Christopher dance because 

[A]: Donald wanted to relax.


[Q]: How does the sentence end?

Aaron was learning to bake from Joseph since 

[A]:
Joseph was an expert at this art.