Therewasstillfiveminutesleftbeforethechemistryclassbegan。Westudentswereplayingandshouting 36 andhappilyinourwaysbeforethe class.Nobodynoticedourchemistryteacher,Mr.Wang 37 intotheclassroom.Hewalkedstraighttothe platformasusualbutwithabeaker(烧杯)andseveralotherchemical 38个inhishands。Hesaidnothingandstartedhisworkwiththesechemicaldevicesonthedesk.Somestudentswereso 39 thattheystoodcloselybyhim wonderingwhatMr.Wangwasdoing.Manystudentswerestillbusywiththeir 40 ofrelaxation.Suddenly,abignoisewokeusup.We 41thefireflowerindisbeliefwithdifferentcolorsrisingabovethebeakerthatMr.Wangwasholding.Thefireflowerwasso 42真的永远消失 hadnever seen.But 43 ourdisappointment,itdisappearedasquicklyaswecouldsee。AlthoughweweresoregretfulandaskedMr.Wangtoperformagain,heturnedusdown.He 44美国