【OnedayMissEllisgaveherpupilsanewkindofhomework：homeworkonhappiness.Herpupilswouldbe“happiness16”，andweretoseewhatwouldhappenwhentheytriedtobringhappinessto17aroundthem．Aspartoftheirhomewo】
OnedayMissEllisgaveherpupilsanewkindofhomework：homeworkonhappiness.Herpupilswouldbe“happiness 16 ”，andweretoseewhatwouldhappenwhentheytriedtobringhappinessto 17 aroundthem．Aspartoftheirhomework，allthestudentsdidreallydelightfulthings 18 whatCarlaChalmersdidlefteveryonesurprised．Severaldaysafterthehomeworkhadbeenhandedout，Carlaturnedupcarryingabig 19 ．
“ 20 inthisbagIhaveallthehappinessI’vecollectedsofar”shesaid 21 .Onseeingthis，everyonewasfilledwith 22 ，butCarladidn’twanttoshowanyonewhatwasinthebag． 23 ，shepulledoutasmallboxandgaveittoherteacher．WhenMissEllishadtakenthebox，Carlatookaninstant 24 outofherownpocketandstoodwithitattheready.
“OpenitMissEllis．”
Theteacherslowlyopenedtheboxandlookedinside．Abig 25 shoneonherface，andatthatmomentCarlatookaphoto，whichcameoutofthecamera 26 ，andshegaveittoMissEllisalongwithasheetofpaper．Theteacherreadthepaper 27 ，andwhenshehadfinished，she 28 atthebag．
“Oh，soit's…”
“Yes!” 29 Carla，openingthebag“It'sagreatbigpileofsmiles!”
Sheopenedthebagand 30 ofdifferentsmilesfellout．
Therestoftheclasstriedto 31 howCarlahadmanagedtocreatesuchagreatchainofhappiness．Allthereinthe 32 wasaphotoofabigsmile．Buteveryonewhohadseenitfelthappinessbeingtransmitted(传送)tothem，and 33 ，withouthesitationeveryperson 34 withasmileoftheirown．
Shemanagedtospreadunderstandingofthe 35 aboutsmile：everytimeyousmileyouaresendingagifttotheworld．
16．A．explorers B．instructors C．players D．collectors
17．A．children B．relatives C．people D．teachers
18．A．for B．but C．since D．as
19．A．bag B．box C．photo D．toy
20．A．Where B．Here C．While D．Why
21．A．disappointedly B．sadly C．anxiously D．smilingly
22．A．