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is made of ……… 是由 ……( 材料 )制成的One possible version: This special pen was invented by Liu Jie. It has three colors and is used for taking notes quickly in class. It was invented in 2022. It is made of plastic and steel. It can remember what the teacher said. It can also help write down the main points. I think it’s a useful invention. It is often difficult to decide on the inventor of certain inventions. This is because sometimes a few people may ______ things which are _______ the same. It’s hard to tell who came up with the idea first. invent, doubt, mention, nearly, website, all of sudden1. Complete the passage with the correct forms of the words in the box.invent nearlySome inventions can also lead to other inventions _____________. So some people _____ whether the inventor came up with the idea himself or herself. They think that the inventor used someone else’s idea to create his or her invention. That is why books or _______ usually _______ more than one inventor when giving information about inventions. all of a suddendoubtwebsites mention1. Someone stole my watch. _________________________________2. They used five eggs to make this big cake. _____________________