[Q]: How does the sentence end?

Since Randy had a job with a high leadership position while Jason was a janitor, 

[A]: Randy felt powerful.


[Q]: How does the sentence end?

Reading complicated science books was a preference of Matthew but not Nelson because 

[A]: Matthew had a good vocabulary.


[Q]: How does the sentence end?

Adam got bitten by a dog, Jason laughed at him. Their father yelled at 

[A]:
Jason .