Self-check 1 P48

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. Some 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.

invent

nearly

all of a sudden

doubt

websites

mention