C)用括号中所给动词的正确形式填空，使短文完整。
Flyingwasonceadream.Foralongtimepeoplehadwantedtobeupinthesky.They11 (try)manyways.Butnothingworked.
ThingschangedonedayinSeptembermorethan220yearsago.TwobrothersfromFrancemadeaverylargeballoonwithpaperandcloth.Tomaketheballoon12 (float)theybuiltafireinsideabasketandhungthebasketbelowtheballoon.Tlieythoughthotairfromthefirewouldbelightenough13 (push)uptheballoon.Tlieywereright!Theirhot-airballoontravelledabout2miies.ltwasintheskyforeightminutes.Nobodywasonboardfortheflight.Tobesafethey14 (invite)aduckaroosterandasheeptobethefirstpassengers.Thehot-airballoonlandedsafely.Noanimals15 (hurt).
Twomonthslaterthetwobrothers16 (set)offtheirhot-airballoonagain.ThistimetheyhadIwopeopleinsidethebasket.Theflightlasted25minutes.ltalsolandedsafely.Thatwasthefirsttimemenhadbeeninthesky!