A opinion is a view, judgment, or appraisal formed in the mind about a particular matter and a informed opinion is a belief, judgment or way of thinking about something based on information. So the difference between them is an opinion is based off of particular matter. While and informed opinion is a judgment based off of information you have.
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Engaged means that they were occupied with whatever activity that He/She/They were doing at the time being.
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Hi! If you're asking about cascade, as there are no underlined words in your sentence, then your answer would be a) Waterfall.
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