阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空，并将答案填写在答题卡标号为16～25的相应位置上。

Onceuponatimeinasmallcountrypeopledecidedtoinvestigatewhatitwasthatparentsreallylikedthemost.Acompetitionwasorganised.Itwouldusethe___16___(late)_inventionofProfessorCrank-Shafte:theGladometer(快乐测量仪).

TodatetheGladometeristheonlycontraptionever__17___(build)capableofmeasuringjoyandhappiness.

Soonebyonethechildrenpresented__18____ownparticulartalentstotheirparents.AndtheGladometerfaithfullymeasuredtheirparents'reactions.

Oneboyturnedup__19___atrainedpig;thepigsanganddanced.Agirlcameandplayedtheviolinlikeanangel.__20___intelligentboycameandreadhisverybigbook.Theparents’happinesswaseasytosee.

FinallyaboycametotheGladometercarrying___21_____.Nordidheknowhowtodoanything.Whentheorganisersaskedhimwhathewasgoingtodohe__22_____(simple)said:"Iamveryobedient（顺从的）."Themachinemeasuredsuchahighreading__23_____itbeganviolentlyshakingandfinally__24_____(explode).Theboywhohaddonenothingwonalltheprizesthatdayforsolvingthemysteryof___25____pleasesparentsthemost.