Onceagroupof50peoplewasattendingaseminar(讨论会).Halfwayth...
问题详情：Onceagroupof50peoplewasattendingaseminar(讨论会).Halfwaythrough 61 （he）talk,thespeakerstoppedanddecided 62 (create)agroupactivity.Hewentaroundthehallandgaveeachpersonaballoon.Eachonewasask...