[解析]
(1)HAVE VACCINE to fight.细节理解题。根据HAVE VACCINE,STAY SAFE.Safe vaccine is well﹣developed and it is the doctor's advice to receive it for our own good.可知,接种疫苗,保持安全。安全的疫苗是成熟的,这是医生的建议。所以作者最想在海报中呼吁读者接种疫苗来对抗COVID﹣19。故答案为HAVE VACCINE to fight.
(2)Xue Mingyu;homework.细节理解题。根据 Homework from Xue Mingyu Class 1,Grade 9 .可知,来自薛明玉,九年级一班作业。所以这张海报是由一个叫薛明玉的学生做的作业。故答案为 Xue Mingyu;homework.
(3)vaccine.词义猜测题。根据Safe vaccine is well﹣developed and it is the doctor's advice to receive it for our own good.可知,安全的疫苗是成熟的,这是医生的建议。所以文章里"疫苗"这个词是"vaccine"。故答案为vaccine.
(4)TO FIGHT AGAINST CORONAVIRUS.细节理解题。根据To fight the virus,countries need to work together.FIGHT AGAINST CORONAVIRUS.可知,为了对抗病毒,各国需要共同努力。抗击冠状病毒。故答案为To FIGHT AGAINST CORONAVIRUS..
(5)harm.推理判断题。根据The World Health Organization (WHO) says, "Not enough is known about COVID﹣19 to draw final conclusions about how it passes from person to person,how it works and changes,how it can be best avoided,or the extent to which it has spread.We don't know bow long it will last.Safe vaccine is well﹣developed and it is the doctor's advice to receive it for our own good."可知,世界卫生组织(WHO)说:"对COVID﹣19的了解还不足以得出最终结论,即它是如何在人与人之间传播的,它是如何工作和变化的,如何最好地避免它,或者它的传播程度。我们不知道它会持续多久。安全的疫苗是成熟的,这是医生的建议。"所以学生要世界卫生组织(WHO)的话作为他的海报,想让读者知道COVID﹣1的的危害性。故答案为harm.