Complete the words with the help of the definitions given.1. a doctor who performs medical operations______________2. printed material used to advertise a product_____________3. be recognized or noted mentally ______________4.a person’s name written by herself or himself______________5.money paid to sb. for selling goods which increase with the quantity of goods sold ______________6.done or existing alone______________7. a person who represents others______________8. the quality of being worthy of honor or respect ______________