Answer: Category: a class or division of people or things regarded as having particular shared characteristics. Synonyms: Organized, social-class Antonym: unorganized The sentence fit into a specific catgeory.
Characteristics: a feature or quality belonging typically to a person, place, or thing and serving to identify it. Synonyms: Value, Feature Antonyms: Whole The girl had many characteristics.
Enviroment: The totality of the natural world, often excluding humans Synonyms: Space, world Antonym: Unnatural Surroundings It is important we treasure our enviroment.
Frequent: occurring or done on many occasions, in many cases, or in quick succession. Synonyms: Often, repeated Antonyms: Rarely The cookies frequently burned.
Acquaintinces: a person one knows slightly, but who is not a close friend. Synonyms: Friend, Peers Antonym: Stranger Kayla looked around at her acquaintinces.
Isolation: the state of being in a place or situation that is separate from others Synonyms: Alone, Introvert Antonyms: Social Isolation is a symptom of depression.
Answer:
shouldn't
Explanation:
that is correct grammer because they shouldn't be opening the doors when the train is moving
I think your answer would be B
