题目内容：

阅读下列短文,从短文后所给的四个选项(A、B、C和D)中选出可以填入空白处的最佳选项。

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 _________ at work in people of all _________.For example,on Christmas morning,children are excited about _________ with their new toys.But their _________ soon wears off and by January those _________ toys can be found put away in the basement.The world is full of _________ stamp albums and unfinished models,each standing as a monument to someone’s _________ interest.When parents bring home a pet,their child _________ bathes it and brushes its fur.Within a short time,however,the _________ of caring for the animal is handed over to the parents.Adolescents enter high school with great_________ but are soon looking forward to _________ .The same is true of the young adults going to college.And then,how many _________,who now complain(抱怨) about the long drives to work, _________ drove for hours at a time when they first _________ their driver’s licenses(执照)?Before people retire,they usually _________ to do a lot of _________ things,which they never had _________ to do while working.But _________ after retirement,the golfing,the fishing,the reading and all of the other pastimes become as boring as the jobs they _________.And,like the child in January,they go searching for new _________.

1.A.principle       B.habit               C.way                   D.power

2.A.parties         B.races               C.countries             D.ages

3.A.working         B.living               C.playing               D.going

4.A.confidence     B.interest            C.anxiety               D.sorrow

5.A.same           B.extra               C.funny                D.expensive

6.A.well-organized B.colorfully-printed   C.newly-collected       D.half-filled

7.A.broad           B.passing              C.different             D.main

8.A.silently        B.impatiently          C.gladly               D.worriedly

9.A.promise        B.burden               C.right                 D.game

10.A.courage       B.calmness             C.confusion             D.excitement

11.A.graduation    B.independence         C.responsibility       D.success

12.A.children      B.students             C.adults                D.retirees

13.A.carefully      B.eagerly              C.nervously            D.bravely

14.A.required       B.obtained             C.noticed              D.discovered

15.A.need           B.learn                C.start                 D.plan

16.A.great          B.strange              C.difficult            D.correct

17.A.time           B.money                C.skills                D.knowledge

18.A.only           B.well                 C.even                 D.soon

19.A.lost           B.chose                C.left                  D.quit

20.A.pets           B.toys                 C.friends               D.colleagues