pleaseIha的精選

問題詳情：請你根據某學校的一個廣播通知，填寫下面的海報。MayIhaveyourattention，please?Ihaveanannouncementtomake．Sincetheresourceissopreciousthateveryoneshouldtrytosaveitallthetime．OurschoolhasinvitedanexpertM...