VI
33. D
34. B
35. A
36. C
VII
37. No, it isn't
38. Adults often find it hard to change the way they speak.
39. Studying pronunciation can help students to understand the rules of English.
VIII
41. B
42. C
43. D
44.A
IX
9. B
10. A
11. D
12. B
13. A
14. D
15. C
16. B
17. A
18. D
19. A
20. C
21. B more -> most
22. D announcing -> announced
23. D saving - energy -> energy - saving
24. B frightening -> frightened
IV
25. Was watching
26. Weren't lived
27. Receiving
28. Write