tolong di bantu di jawab kak

15.c
16.b
17.c
18.c
19.c
20.d
21.b

15. C. Thanks
16. B. Congratulations
17. C. Refuses
18. C. Congratulate him for the winning
19. C. Once a week
20. D. Students grade 7&8
21. B. Two hours
22. A. Inviting someone
23. B. Alvan

Semoga membantu ^^