[Q]: How does the sentence end?

When the doorbell rang, Donald opened the door and greeted Joel.

[A]: Donald was hosting a party.

[Q]: How does the sentence end?

Robert's clothes were dirty while Michael's were clean because

[A]: Robert had a broken washing machine.

[Q]: How does the sentence end?

Megan woke up with a bad hangover but Patricia did not because

[A]:
Megan drank vodka at the party.