Here are the correct answers for each question based on the context provided:

1. **Barry continued to smoke even though we had advised him to quit.**
**Correct Answer: C. Barry did not quit smoking because of our advice.**

2. **Many people think Steve stole the money.**
**Correct Answer: D. The money is thought to be stolen by Steve.**

3. **Even though it was raining heavily, the explorers decided to continue their journey.**
**Correct Answer: C. The heavy rain could not prevent the explorers from continuing their journey.**

4. **He cannot afford a new computer.**
**Correct Answer: A. The new computer is so expensive that he cannot buy it.**

5. **The roads were slippery because it snowed heavily.**
**Correct Answer: A. It snowed too heavily to make the roads slippery.**