[Q]: How does the sentence end?

Brett's beta fish ate Matthew's goldfish when they put them in the same tank, and 

[A]: Brett felt just awful about it.


[Q]: How does the sentence end?

Since Nelson was assertive at work and Donald was not, 

[A]: Donald did not make a lot of sales with their clients.


[Q]: How does the sentence end?

Jessica invited Erin to graduation because 

[A]:
Jessica had worked hard and was getting a diploma.