The dog of Ian goes on few walks, while Adam always takes his dog walking, so 
OPTIONS:
- Ian is a prudent dog owner.
- Adam is a prudent dog owner.
Adam is a prudent dog owner.

Samantha was was quite active, so was a good coach for Emily's weight loss because 
OPTIONS:
- Samantha could teach healthy habits to him.
- Emily could teach healthy habits to him.
Samantha could teach healthy habits to him.

Nick gave Matthew a dose of medication because he had a fever. 
OPTIONS:
- Nick checked on him later.
- Matthew checked on him later.
Nick checked on him later.