What is the correct comma usage in these sentences? Oil which is lighter than water rises to the surface. Madame de Stael was an attractive gracious lady. Nice is a word with many meanings and some of them are contradictory. The contractor testified that the house was completed and that the work had been done. I told everyone to send their RSVE to you Helen. The closet contained worn clothes old shoes and dirty hats. After a good washing a grooming, our pup looked like a new dog. Mark Twain's early novels I believe stand the test of time. The field was safe enough wasn't it? He replied "I have no idea what you mean". He became aware of the Russian's genius after he read the Chekhov stoory. Dauphin Island located off the coast of Alabama is a favorite spot for fishermen.