=>
IV/
25. accountant
26. effectively
27. electric
28. Innovation
29. polluting
30. disappointment
V/
31. We can reduce the electricity consumption by using energy-saving bulbs.
32. Too many fertilizers and pesticides are damaging to the soil.
VI/
33. Because the matter is very difficult, I can't explain.
34. The principal suggested our students should be encouraged to study hard.
35. As she was lazy, she didn't finish her work yesterday.
36. If you don't practice sports, you will be sick eaisly.