The workers demanded that their employer_____ their working conditions. 

A．had improved

B．would improve

C．improve

D．will improve

保安员在执行区域巡逻过程中，常见的异常情况主要有（）

A.异常气味

B.异常的人

C.异常物品

D.异常设施设备

E.异常天气状况