Whenanearthquakehappens，Ithinkthemostimportantsafetyistokeepcalm（）A.ruleB.doubtC.conditionD.problem
When an earthquake happens，I think the most important safety _____ is to keep calm（ ）
A. rule
B. doubt
C. condition
D. problem
首先明确选项中名词的意思，A：规则；B：疑虑；C：状况；D：问题； 根据When an earthquake happens和设空处前面的safety推测句意是"当地震发生时，我认为最重要的安全规则是保持冷静．"，由此判断句子中缺少"规则"一词，故答案为A．
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