sinCE two spEAkErs ArE now unABlE to AttEnD，wE shAll rEquirE only 2 sEminAr rooms instEAD oF thE 4 BookED． A．now two sEminAr rooms ArE Enough． B．morE sEminAr rooms will BE nEEDED． C．six sEminAr rooms hAvE BEEn rEsErvED．