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C<span>onscientiousness. It means that you are concerned about doing what is correct. The student knows that studying and coming to class everyday is correct and is concerned. So therefore he/she does this.
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"the book that I liked best" is the complete subject clause because it replaces the subject (the proof is that it agrees with the verb was). The adjectival clause is then "the one about the big fish" because it describes the subject in more detail (which is always the function of the adjective).
