填空题 Think twice next time someone asks you for "five minutes of your time" it could cost you more than you think. A British professor has{{U}} (36) {{/U}}a mathematical{{U}} (37) {{/U}}to help people find out exactly how much an hour of their time is worth. Professor Ian Walker of Warwick University{{U}} (38) {{/U}}the value of time after research showed that over 80 percent of{{U}} (39) {{/U}}would buy more time if they could{{U}} (40) {{/U}}it. "Traditionally, wages or salaries have given an{{U}} (41) {{/U}}of how we are valued at work," Walker, an{{U}} (42) {{/U}}professor, said in a statement. "However, by looking at salaries against taxation, the cost of living and{{U}} (43) {{/U}}variations, we can see{{U}} (44) {{/U}}" The formula could help in making decisions, such as whether to cook a meal or to get a takeaway, or whether to take public transport or a taxi. Visitors to www. barclaycard,co.uk/ timeismoney can{{U}} (45) {{/U}}by entering their salary, the region where they work and what kind of work they do. For example, for a professional working in London and earning 25, 000 pounds a year, an hour would be worth 6.44 pounds, according to the Web site. Cooking dinner would cost 5.37 pounds - cheaper to get a takeaway,{{U}} (46) {{/U}}. Brushing your teeth comes at 32 pence--perhaps hard to find someone to do it for you for less.