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 ___.