Problem: How does the sentence end?

Because Lindsey was running faster than Monica, 
OPTIONS:
- Lindsey finished the lap over 3 minutes behind.
- Monica finished the lap over 3 minutes behind.
Answer: Monica finished the lap over 3 minutes behind.

Problem: How does the sentence end?

My relationships as a teen worked out far differently from my adult ones because the 
OPTIONS:
- teen ones were too immature.
- adult ones were too immature.
Answer: teen ones were too immature.

Problem: How does the sentence end?

The crane was useless to build the house, but we used the backhoe, as the 
OPTIONS:
- crane was essential at that point.
- backhoe was essential at that point.
Answer: backhoe was essential at that point.

Problem: How does the sentence end?

Ken tried to draw a design onto his stencil paper while using a pencil, but the paper ripped because the 
OPTIONS:
- pencil was too thin.
- paper was too thin.
Answer:
paper was too thin.