or
or
Select from the following and complete the sentence: "The police____________ to be alert as the criminal was dangerous.
In this sentence, "The police" is being referred to as a group, and "had" is the past tense of "have" which is used to indicate that this is an action that was completed in the past, so it's plural form here. The sentence is describing a situation where the police as a group were required to be alert because of the danger posed by the criminal.
