Sure, I can help you with this! Let's go through the questions step by step.

### For the first section (Questions 21-26):

1. **Question 21:** A (on)
2. **Question 22:** B (limited)
3. **Question 23:** C (naturally)
4. **Question 24:** D (used)
5. **Question 25:** A (it)
6. **Question 26:** B (most effective)

### For the second section (Questions 27-32):

1. **Question 27:** B (the prospect of driverless cars)
2. **Question 28:** A (park themselves)
3. **Question 29:** A (by viewing road signs)
4. **Question 30:** C (traffic lights quickly)
5. **Question 31:** A (in about)
6. **Question 32:** H (the idea)

Make sure to double-check the context of the passage and your specific answers to ensure accuracy!