| 1 | Sparks! Fire! Primitive man had made fire by striking sparks, and with some of those dry crumbly bushes as tinder... | |
| 2 | We should such as general, concentrate on, always insist. | |
| 3 | I found a bent stick in the woodpile , and I can make a drill. | |
| 4 | From getting fire by drilling into wood and getting water with leaves to coarse white pottery made by fire and soil; | |
| 5 | Not just follow what ancient people did. He thought that in ancient time, people built houses in trees and made fire by drilling wood because of the reality at that time. |