Problem: How does the sentence end?

Sarah asked Elena what are the best actions to increase fertility, because
Answer: Sarah did not know the course of action.

Problem: How does the sentence end?

Katrina wanted to start a debate with Elena because
Answer: Katrina was very well informed and would win.

Problem: How does the sentence end?

Jeffrey played with the slime, but Dennis didn't, because
Answer: Jeffrey doesn't mind getting their hands dirty.

Problem: How does the sentence end?

Robert was very stubborn but Matthew always was willing to compromise, so
Answer:
Matthew was willing to accept advice.