Put the correct noun form of the underlined verb…

1. If you invent something important, this invention may become famous.2. Something that arrives, such as a plane flight, is an arrival.3. You can say you improve something, or that you make an improvement to it.4. Something you publish, such as a book or a magazine, is a publication.5. If you explain something clearly, then you are giving a clear explanation.6. Someone who trains people to do something is a trainer.