What kinds of people often give drugs to their children? Where in the world do people drug before going to work? The answers are simple—ordinary people, just about 【26】______ . And the drug 【27】______ question is caffeine. Scientists estimate that over 70% of the world's population takes caffeine daily. 【28】______ drink it in tea and coffee. Children drink in tin Coca Cola and 【29】______ soft drinks. It is also found in chocolate. 【30】______ , most people in the most places at any time are under the 【31】______ of the drug. There have been many scientific investigations 【32】______ the exact effects of caffeine. Most people agree that it 【33】______ the nervous system and helps the body make efficient use of energy. This is why many people 【34】______ Asia drink tea with food and why westerners often end their meals 【35】______ a cup of coffee. Because the effect of caffeine is so 【36】______ , there have been 【37】______ attempts to stop people using it. A U.S. religious group which 【38】______ the use of caffeine is generally regarded as eccentric (反常的). But because nearly everybody takes it, the total effect of caffeine 【39】______ people is huge. Caffeine is the drug that changed the world. Both tea and coffee were introduced to the West around 300 years ago. The effect of these new drinks was felt 【40】______ in New York, coffee houses were 【41】______ with people making plans, 【42】______ business and doing deals. And the deals done in the coffee houses were partly responsible 【43】______ a rapid increase in American trade. History was moving 【44】______ that direction anyway. But the arrival of coffee 【45】______ everything up. 【26】