=>
23. Which
24. Struck
25. Resulted
26. Strength
27. Power
28. B ( Man probably made his fire... together)
29. D (đầu đoạn 2)
30. C ( Red Indians, for example, used fire to make smoke signals)
31. B ( fire is also used to give light ...light the streets)
32. A (2 dòng đầu đoạn cuối)