1-C. As we have seen here, the various counting systems people have invented are an excellent example of this.As we have seen here, the various counting systems people have invented are an excellent example of this.
2-C. (1) In 1877, Thomas Edison invented the phonograph, a new device that could record and play back sound.(1) In 1877, Thomas Edison invented the phonograph, a new device that could record and play back sound.
3-C. Uranus and Neptune were not discovered until after the telescope was invented centuries later.Uranus and Neptune were not discovered until after the telescope was invented centuries later.
天王星と海王星は、発見されませんてせした、望遠鏡が発明された後までダヨ、何世紀も後にダヨ。
4-C. One writer, in fact, called the minuet one of the best schools of manners ever invented.One writer, in fact, called the minuet one of the best schools of manners ever invented.