题目内容：

阅读下面短文，从短文后各题所给的四个选项（A, B, C, D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。

As a general rule, all forms of activity lead to boredom when they are performed on a routine 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 wear 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 the animal is handed over to the parents. Adolescent enter high school with great_______but soon looking forward to________. The same is true of the young adults going to the college. And then, how many_________, who complain about the long drives to work, _________drove for hours at a time when they first_________  their drivers licenses? Before people retire, they usually  _______to do a lot of_____things, which never had _____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. choose C. left D. quit

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