^^
18.
A world without this is almost unimaginable. This plays an essential role in various scientific fields and in industry. It is used throughout the home, at work, and often in play. One of the greatest benefits of this is that it lets in light and provides protection from the weather at the same time. This allows daylight in but keeps out cold or stormy weather. Electric bulbs transmit light but keep out the oxygen that would cause their hot filaments to burn up. Television picture tubes enable viewers to see the image that is formed inside the tube. Bottles can reveal their contents without being opened.
19.
The first true piece of sports equipment that man invented was the ball. In ancient Egypt, pitching stones was children’s favorite game, but a badly thrown rock could hurt a child. Egyptians were therefore looking for something less dangerous to throw. And they developed what were probably the first balls. They were first made of grass or leaves held together by strings, and later of pieces of animal skin sewn together and stuffed with feathers or hay. Even though the Egyptians were warlike, they found time for peaceful games. Before long they devised a number of ball games. Perhaps they played ball more for instruction than for fun. Ball playing was thought of mainly as a way to teach young men the speed and skill they would need for war.
20.
It is my great pleasure to inform you that your sons and daughters have completed all the academic requirements over the last three years of study at Hutt High School. We feel as if the day they entered our school were yesterday, and now they will proudly receive their graduation certificates. Not unlike many successful graduates in our long history, your children will go out into the world, and successfully participate in the fields of politics, economics, culture, and education. The graduation ceremony will be held next Friday in Hutt High School’s Assembly Hall. On behalf of the school, I would like to extend our invitation to you and your family. I look forward to meeting you there.
