请你根据某学校的一个广播通知，填写下面的海报。 May I have your attention, please? I have an announcement to make. Since the A/H1Nl flu is around us, we should pay great attention to our health and get some knowledge about the terrible disease. Our school has invited Doctor Li to give us a talk about how to prevent (预防) the flu. It will start at 4:00 on Friday aftemoon in our school lecture hall. Students in Grade Seven are required to attend the talk. Please be there o n time. That's all. Thank you. An Important Talk Topic: How to prevent the 1______. Time: 2______ on Friday afternoon. Place: School lecture 3______. Speaker: 4______. 5______: Students must be present.