[Q]: How does the sentence end?

Mary would rather swim in the pool and not the lake because the 

[A]: lake was dirty.


[Q]: How does the sentence end?

Mary left the envelopes in the basket and focused on addressing the postcards, because the 

[A]: envelopes were nonurgent.


[Q]: How does the sentence end?

Neil wanted to help his good friend Benjamin quit smoking for 

[A]:
Benjamin was an current smoker.