You will be given a definition of a task first, then some input of the task.
In this task, you will be shown a passage. You need to write a fill-in-the-gap question based on your understanding of the events that might be inferred from the passage. Your question should be answerable based on the passage and only have one correct answer. Show the gap in your question with a _ .

(CNN) Nearly everyone carries one version or another of the herpes virus. A recent study suggests that the new gene-editing technology known as CRISPR/Cas9 may be able to eliminate this ever-present virus -- or at least suppress it. "At this point, there is no cure for the herpes virus infection. Once infected, you're infected for life," said Robert Jan Lebbink, co-author of the study and a molecular biologist at University Medical Center in Utrecht, Netherlands. The virus develops a latent stage, in which it lies dormant in an infected cell without reproducing. Because our immune systems cannot recognize latent infections, we cannot clear them from our bodies.Only eight of more than 100 herpes viruses routinely infect humansTested in a petri dish, CRISPR gene-editing technology eliminated some strains
Output:
So, while it appears the _/Cas9 system may be very effective in rooting out herpes, Lebbink explained that much more research is needed.