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第一部分 必修2 Unit 4 Ⅰ.完形填空 (2017全国课标) As a general rule, all forms of activity lead to boredom when they are performed on a routine (常规) basis.As a matter of fact, we can see this __1__ at work in people of all __2__.For example, on Christmas morning, children are excited about __3__ with their new toys.But their__4__soon wears off and by January those __5__ toys can be found put away in the basement.The world is full of __6__stamp albums and unfinished models, each standing as a monument to someone's __7__ interest.When parents bring home a pet, their child __8__bathes it and brushes its fur.Within a short time, however, the __9__ of caring for the animal is handed over to the parents.Adolescents enter high school with great __10__ but are soon looking forward to__11__.The same is true of the young adults going to college.And then, how many __12__， who now complain (抱怨) about the long drives to work, __13__ drove for hours at a time when they first__14__their driver's licenses (执照)? Before people retire, they usually __15__ to do a lot of __16__ things, which they never had __17__ to do while working.But __18__after retirement, the golfing, the fishing, the reading and all of the other pastimes become as boring as the jobs they __19__.And, like the child in January, they go searching for new __20__. ()1.A．principle B．habit | 
