Problem: How does the sentence end?

Elena had a lot of fear of heights while Cynthia was fearless, and 
Answer: Elena refused to go skydiving.

Problem: How does the sentence end?

The diamonds on the earrings were brighter than the ones on the ring, because the ones on the 
Answer: earrings were clearer.

Problem: How does the sentence end?

James found that the tank was surprisingly easy to operate and not the vehicle because the 
Answer: tank had simple controls.

Problem: How does the sentence end?

During the surgery Jason made sure not to damage any of Adam's organs because 
Answer:
Adam was a patient.