Put the correct noun form of the underlined verb in the gap to complete the definitions. 1.If you invent something important , this __ may become famous . 2.Something that arrives , such as a plane flight , is an __ . 3. You can say you improve something, or that you make an___ to it. 4.Something you publish , such as book or a magazine is a ___. 5.If you explain something clearly , then you are giving a clear ___. 6. Someone who trains people to do something as a ___.