[Q]: How does the sentence end?

Aaron  is jealous of Kevin because 

[A]: Kevin is chosen to be the best man at the wedding.


[Q]: How does the sentence end?

Neil went swimming in the ocean and Aaron did not because 

[A]: Neil was fearless concerning shark attacks.


[Q]: How does the sentence end?

Zack had to fix the broken machine and replaced the gears but left the pins because the 

[A]:
gears were rusted.