Scientists __________ (study) how much coffee people consume today., I __________ (consume) too much coffee this morning., Historians __________ (examine) historic records from the 17th century., Researchers __________ (study) how caffeine fuels alertness for decades., Many books __________ (claim) that coffee was originated in Ethiopia., Farmers __________ (roast) coffee seeds all morning., Researchers __________ (suggest) that caffeine can suppress hunger., Scholars __________ (look to) science for centuries., Farmers __________ (roast) thousands of coffee seeds this week., Doctors __________ (monitor) patients’ digestive systems since Monday., Scientists __________ (observe) how compounds bind to the receptors in nerve cells., Scientists __________ (observe) how caffeine binds to the receptors for the last few hours., Economists __________ (calculate) that a third of Europeans drink coffee this year., Researchers __________ (estimate) the growth of coffee consumption over the last month., Companies __________ (introduce) caffeine supplements in the last five years., Manufacturers __________ (devote) time to creating caffeine supplements this week., Nutritionists __________ (study) how caffeine affects state of alertness., Nutritionists __________ (study) how caffeine can inhibit feeling of fatigue for several months., Researchers __________ (consider) why coffee became the most widely consumed beverage., Scholars __________ (question) interpretations of the world since the Age of Enlightenment., Traders __________ (record) changes in coffee consumption before it spread to Europe., People __________ (experience) a state of drowsiness since yesterday afternoon., Scientists __________ (investigate) cases of nausea caused by too much caffeine this year., People __________ (feel) nausea all day., Historians __________ (look at) how the Ottoman Empire influenced coffee trade over the past century., Scholars __________ (question) the role of the Age of Enlightenment in science recently., Doctors __________ (observe) how caffeine is absorbed via the intestine today., Doctors __________ (monitor) how caffeine is absorbed via the bloodstream this week., Researchers __________ (consider) the effects of caffeine on the digestive system recently., People __________ (look to) caffeine to boost productivity for many years.

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