"The police have asked us all to be on the ....... for an older man in a green pickup truck. Apparently, he is*^*parking his van in the lots of local businesses and is abducting women as they walk to their cars. If anyone*^*sees someone that fits that description, either let me know or call the police immediately, " the manager told*^*her staff.
A.alert
B.eye
C.seeing
D.observe
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