Answer:
1. c.
2. a.
3. b.
4. b.
5. b.
6. a
7. c
8. b
9. true
10. b
11. I
12. Me
13. Whom
14. Whom
15. Who
16. their
17. there
18. incorrect
19. correct.
Step-by-step explanation:
18. the correct sentence is "There's a festival in the town."
Their is used when denoting person in plural.
There is used to tell about a place.