Here are the answers based on the questions provided:

1. **Question 30:** A. valuable
2. **Question 31:** C. peak
3. **Question 32:** D. occurrence
4. **Question 33:** C. preserve
5. **Question 34:** A. charm
6. **Question 35:** C. development
7. **Question 36:** A. disaster
8. **Question 37:** B. design
9. **Question 38:** D. location
10. **Question 39:** C. occurrence
11. **Question 40:** B. impact
12. **Question 41:** C. goal
13. **Question 42:** A. support
14. **Question 43:** B. location
15. **Question 44:** C. permission
16. **Question 45:** A. contribution
17. **Question 46:** D. involvement
18. **Question 47:** A. development
19. **Question 48:** B. support
20. **Question 49:** B. support
21. **Question 50:** C. risk

**Grammar Section:**

1. **Question 1:** D. has seen
2. **Question 2:** D. had gone
3. **Question 3:** D. has told

I hope this helps!