Problem: How does the sentence end?

Randy loved flash card memory games while Kevin hated them because 
OPTIONS:
- Randy was very bad at recalling images.
- Kevin was very bad at recalling images.
Answer: Kevin was very bad at recalling images.

Problem: How does the sentence end?

Unlike Craig, Justin was proud with his wife, so 
OPTIONS:
- Craig wanted to show her to everyone.
- Justin wanted to show her to everyone.
Answer: Justin wanted to show her to everyone.

Problem: How does the sentence end?

My dog started to have a stroke, and the medicine I used didn't help because the 
OPTIONS:
- stroke was too weak, so I called the animal hospital.
- medicine was too weak, so I called the animal hospital.
Answer: medicine was too weak, so I called the animal hospital.

Problem: How does the sentence end?

Bill replaced his entire grass lawn for his house with new rock. The 
OPTIONS:
- lawn was old.
- rock was old.
Answer:
lawn was old.