Problem: How does the sentence end?

The sound from the train was louder than the sound from the car because the
Answer: train had a bigger engine.

Problem: How does the sentence end?

Megan was dreading the test in class but not Angela because
Answer: Angela was a good student.

Problem: How does the sentence end?

On a hot summer day, Kai studied in the bathtub after the A/C at the library got broken, the
Answer: library was hot.

Problem: How does the sentence end?

William could only climb beginner walls while Jason climbed advanced ones because
Answer:
Jason was very strong.