[Q]: How does the sentence end?

Betty asked Maria to buy her some popcorn at the movies because

[A]: Maria had unlimited money.

[Q]: How does the sentence end?

Elena was in the audience while Natalie performed, so

[A]: Elena clapped when the show was over.

[Q]: How does the sentence end?

The pilot took Katrina up for a free ride in the plane unlike Cynthia because

[A]:
Katrina asked politely.