Problem: How does the sentence end?

I wanted a treat either chocolate or watermelon. I chose the 
OPTIONS:
- chocolate although it was sweet.
- watermelon although it was sweet.
Answer: chocolate although it was sweet.

Problem: How does the sentence end?

The plants stopped manufacturing robots and switched to cars, as the 
OPTIONS:
- robots were expensive to produce.
- cars were expensive to produce.
Answer: robots were expensive to produce.

Problem: How does the sentence end?

It hurt when the bar was pressing on his chest, but not the beam, because the 
OPTIONS:
- beam was light.
- bar was light.
Answer: beam was light.

Problem: How does the sentence end?

Natalie never checks the air in the tires while Tanya does and you just knew 
OPTIONS:
- Natalie would have full tires.
- Tanya would have full tires.
Answer:
Tanya would have full tires.