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Unit 1 Lifestyles Ⅰ.完形填空 You have waited 45 minutes for the valuable 10 minutes' break between classes.But when the bell for the next class rings，you can't __1__ how quickly time has passed. If you are familiar with this __2__，you'll know how time flies when you are having fun and __3__ when you are bored.Now scientists have __4__ a reason why this is the case. Scans have shown that patterns of activity in the brain __5__ according to how we focus on a task.When we are __6__，we concentrate more on how time is passing.And this makes us __7__ the clock is ticking more slowly. In an experiment __8__ by a French laboratory,12 volunteers watched an image __9__ researchers monitored their brain activity. The volunteers were told to __10__ concentrate on how long an image appeared，then __11__ the color of the image，and third，study both the duration and the color.The results showed that the __12__ was more active when the volunteers paid attention to __13__ subjects. It is thought that if the brain is __14__ focusing on many aspects of a task，it has to __15__ its resources，and pays less attention to the clock.__16__，time really passes without us __17__ it，and seems to go quickly.If the brain is not so active，it concentrates its __18__ energies on monitoring the passing of time.__19__，time seems to drag. | 
