invention

1.Before the invention of paper， what had been used as writing material？2.Which invention was made for navigation?3.The definition of invention is: Invention refers to a new technical solution suitable for practical use that is applied to the s4.There are three types of patents in China: invention patents, utility model patents, and design patents.5.The New Stone Age around 10,000 years ago saw the invention of metal tools and the wheel.6.A patent is a （） for an invention granted by a government to the inventor.7.The computer，（）is a 20th century invention，has created startling technological changes in the way we organize and produce inform8.The history of fast food in America runs parallel to the invention of the car.9.The moon cake is a modern invention; our ancestors never had moon cakes.10.The invention brought him fame ( ) moreover, it brought him money.