Did I write these sentenses corectly?

1. I have a reasonable reason not to go to the party.
2. He said it formidably.
3. I can't find the definition of the word.
4. The distribution of food must be fair.
5. Have i done something illegal?
6. Sara gave me an individual room.
7. I think, it is a good concept of the origin of the universe.
8. I couldn't identify the thief.
9. Life is present  everywhere on the Earth.
10. Last two weeks I have been studying criminal legislation.
11. One hundred years ago many factories used only manual labor. 
12. - I've forgotten your book. - Don't worry. It's insignificant.
13. I don't have access to the section.