And the answer is D.<span>The puffy, white clouds sailed across the sky. It is a vivid sentences are correct.
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When he wrote This excerpt he was referring to knowledge, he said that he reads a book a day and that knowledge was his banknote that got him so far,
I would agree with you - the conclusion should leave readers with an important thought at the end.
This thought should never be new, or opposing to the previous ideas you had been writing before. It also shouldn't be confusing, but quite conversely - it should explain everything and put everything in place.
The end for example cat touched the hat