【正确答案】
We also should never forget that advertisements make a positive contribution to our wallets. Without this source of income, newspapers, commercial radio stations and TV companies couldn't survive. The fact that we spend very little money to buy a piece of daily or we can appreciate so many programs on the air are due to the advertisers who are responsible for this part of money. To think over, if you are made to pay the whole price, how expensive the newspapers will be!