The government is and will take the necessary steps to maintain security and stability.A.

The government is and will take the necessary steps to maintain security and stability.
A. on the alert
B. out of control
C. on guard
D. in vain

(答案→)A. on the alertB. out of controlC. on guardD. in vain解析：　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.) (司机必须密切注视交通信号。)out of control 失去控制；on guard站岗；in vain 徒劳，无效。

我也是这个答案