Great inventions change the world. They help people live better life. The wheel is perhaps the (great) invention in history. After (it) invention, travelling became faster and (comfortable). Without the wheel, we would not have carriages, trains and cars. In 1867, the telephone, one of the (one) practical inventions, was invented. Alexander Graham Bell was its (invent). Since then, people have been able (speak) to each other over long distances. Mobile phones allow people to keep in touch each other anytime, anywhere. Thomas Edison (develop) the practical light bulb in 1879. With light bulbs, people can do as many things in the evenings they can in the daytime.
