Multiple choice Directions: Choose the correct meaning of the given word. Substantiate Imagine Surmise Exchange Prove Reveal answer Fill a bubble to check yourself D Correct answer Explanation To substantiate means to provide evidence to support or prove the truth of a claim or statement. Therefore, 'prove' is the correct synonym. 'Imagine' and 'surmise' imply a lack of evidence, which is the opposite of substantiating.