题目内容：

阅读短文，从方框中选择适当的动词，并用其适当形式填空。有的需要加助动词或不定式符号 (每词限用一次)。

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Beijing (CNN) reported that on the December 31st 2014, there were so many people on the beautiful beaches of Shanghai. When the people  1.________themselves, there were so many people that a terrible tragedy(惨剧) took place suddenly. Thirty-six people  2.____________ their lives in this accident. The victims(遇难者) were young, with an average age of just 22. The oldest was 37, the youngest was only 12. Witnesses(目击者) have  3.______________ what they saw on the beaches. There are many different voices about the reason of this accident. The real reason of it is being4.__________. We all believe that we will get the truth one day. President Xi Jinping has called for a full and immediate investigation(调查) into the cause of the tragedy. Xi called for all-out efforts to help the injured. President Xi said governments across the country should  5.______________measures(措施) in order to better protect public safety during major public holidays and celebrations.