Problem: How does the sentence end?

When Adam answered the phone, he heard Joseph laughing with friends; 
Answer: Adam felt jealous he wasn't there.

Problem: How does the sentence end?

Ian had a beautiful aquarium full of fish but Michael did not because 
Answer: Michael did not enjoy collecting exotic fish.

Problem: How does the sentence end?

Justin decided to give his place to Steven in the mountain expedition because 
Answer: Justin was too tired.

Problem: How does the sentence end?

The doctor said that Neil broke his bone unlike Kyle, due to 
Answer:
Neil being careless.