since flowers can't actually reach to the sky it means that the flowers were growing very tall
Sentiences 3 and 8 because they express emotional thought other than fact. For sentence three, using "terrible waste" can be debateable and shows more of an opinion. And sentence 8, by using "shouldn't" showing its still a posssiby something can or can not happen.
I would say <span>B. revising for unity.
A. could be a way of editing but it could be changing sentences and not actually taking out or adding sentences like B.
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Cannot is formal, while can't in informal.
"Cannot" and "can not" are interchangeable, but when you are asking question for example:
"why can't I...", you can also say "why can I not..." (which is more formal), but you can't say "why cannot I..."
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