Choose the best option

Here are the best options for each question:

16. **B** historic
17. **C** erupted
18. **A** visit
19. **D** the
20. **C** to join
21. **B** It's nice of you to say so.
22. **C** relieved
23. **B** will work / is
24. **A** starts
25. **D** always
26. **C** finish
27. **B** frightened
28. **D** empty
29. **pollution**
30. **legal**

Let me know if you need further explanations or help!