语法填空 Researchers Are Racing to Make a Corona Virus Vaccine. Will It Help? In the early days of January, as cases of a strange, pneumonia-like illness _____ 1 _____ (report) in China, researchers at the National Institutes of Health readied _____ 2 _____ (they) to hunt for a vaccine to prevent the new disease. Historically, vaccines are one of the greatest public health tools to prevent disease. But even as the new technology, advancements in genomics and _____ 3 _____ (improve) global cooperation have allowed researchers _____ 4 _____ (move) at unbelievable speed, vaccine development remains _____ 5 _____ expensive and risky process. It takes months and even years because the vaccines must undergo extensive testing in animals and humans. In the best case, it takes at least a year and most likely even _____ 6 _____ (long)—for any vaccine to become available _____ 7 _____ the public. With each outbreak, scientists _____ 8 _____ (typical) have to start from scratch. After the SARS outbreak in 2003, it took researchers about 20 months from the release of the viral genome to get a vaccine ready for human trails. By the time an epidemic _____ 9 _____ was caused by the Zika virus occurred in 2015, researchers brought the timeline down to six months. Now, they hope the joint _____ 10 _____ (effort) will cut that time in half.