Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: (CNN) German Chancellor Angela Merkel on Thursday described recent attacks in the country and across Europe as "shocking, depressing and terrifying," but she refused to back down from an open-door refugee policy that has attracted fierce criticism following recent assaults in the country. What are the rules for asylum seekers in Germany? Germany has been rattled by four attacks in the past two weeks, three of which authorities say have been carried out by asylum seekers or refugees inspired by Islamist extremism. The attacks have given way to mockery by some Germans as well as foreigners, who have dubbed the recent weeks of bloodshed on social media as #MerkelSommer, or even "Merkel's summer of slaughter."Merkel defends Germany's decision to accept 1 million refugees in 2015Chancellor confirms ISIS can infiltrate the refugee route 
 Question:At the same time, she said _ must improve the process for repatriation of migrants whose asylum applications had been rejected.

German