Read the article below. Choose the correct word to fill in the gaps.Read the magazine article below about a company which checks on the service provided by shops. Choose the correct word to fill each gap.SECRET SHOPPERS Tim Wright knows all about making companies more efficient. His firm, Check-up, sends "secret shoppers" into retail and leisure companies order to make sure that customers are receiving good service. After visit, the secret shoppers prepare a report for the company to let them know good or bad the service was. “Companies like to know, "says Mr. Wright, "that customers go into a store just a few minutes before closing time, they will get good service." Check-up set up in the west of England in 1992 and two years moved to London so it could offer a nationwide service. the last three years , Check-up's profits have dramatically as companies have come to realize great importance of good customer service. Having started with just three employees, Check-up now has a staff sixty-five and last week an important new contact with a major supermarket chain.