Put the correct noun form of the underlined verb in the gap to complete the definitions. 1.If you invent something important

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 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.