Russian Ambassador to Turkey Killed in Shooting

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exhibition - n. a public show of something

role - n. a part that someone or something has in a particular activity or situation

detector - n. a device that can tell if a substance or object is present

unfortunately - adv. used to say that something bad or unlucky has happened

justification - n. an acceptable reason for doing something

envoy - n. a person who is sent by one government to represent it in dealing with another government