The government is _____ and will take the necessary steps to maintain security and stability.
A．on the alertB．out of controlC．on guardD．in vain
A
on the alert (="alert;" watchful; careful) 警惕，小心：Drivers must be on the alert for traffic signals. (="Drivers" must be especially careful to see signals when driving a car.) (司機(jī)必須密切注視交通信號。) out of control 失去控制；on guard站崗；in vain 徒勞，無效。
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