=>
VI/
23. B thời đại
24. D -> chỉ vật
25. C bắt đầu
26. B liệu rằng
27. D It
28. A để

VII/
29. effective (adj + N)
30. solar ( solar energy : năng lượng mặt trời)
31. distinguishes (v) : làm khác biệt, phân biệt
32. informative ( be very adj)
33. joyfully ( sang là động từ -> cần trạng từ)
34. nomiated ( has been V3/ed)

VIII/
35. COVID-19 is a new illness that can affect your lungs and it's caused by a virus called Corona-virus.
36. The energy can be stored for a number of days so that you can use solar energy on cloudy days too.

IX/
37. Lan suggested that they should wash their hands before meals to avoid being infected with corona virus.
38. The last time I went to the cinema was two months ago.
39. The girl whose family I know very well is a good person.
40. Although he was disabled, he sailed around the world.