Write in the commas for these sentences, and if no comma is needed, leave the sentence alone.
1. He left the scene of the accident and tried to forget that it had happened.
2. Oil which is lighter than water rises to the surface.
3. Madame de Stael was an attractive gracious lady.
4. Nice is word with many meanings and some of them are contradictory.
5. The contractor testified that the house was completed and that the work had been done properly.
6. Some people refuse to go to the zoo because of pity for creatures that must live in small cages.
7. Taxicabs that are dirty are illegal in some cities.
8. The closet contained worn clothes old shoes and dirty hats.
9. The uninvited guest wore a dark blue tweed suit.
10. After surviving this ordeal the trapper felt relieved.
11. Mark Twain’s early novels I believe stand the test of time.
12. December 7 1941 will never be forgotten.
13.The field was safe enough wasn’t it?
14. Write the editor of the Atlantic 8 Arlington Street Boston Massachusetts 02116.
15. He replied "I have no idea what you mean."
16. After a good washing and grooming the pup looked like a new dog.
17. Because of their opposition to institutions that force creature to live in captivity some people refuse to go to the zoo.

Thanks for your time!
Yes i have done these myself. I just needed to check my work since my teacher said it would count as a test grade!