People can always get help from s_ _ _ _ _ _s in the army in time of danger.(应填哪几个字母)

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• People can always get help from s_ _ _ _ _ _s in the army in time of danger.(应填哪几个字母)
• People can always get help from s_ _ _ _ _ _s in the army in time of danger.(应填哪几个字母)
• 1、When do people always look around from time to time?2、Why don't fishes live on land?
• 36→18 39→27 67→?2）45→21 36→19 39→28 67→?3）63→2 93→3 41→4 82→?三个问号应该填多少为什么怎么算出来的.