I believe the answer is short
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The abbreviations after the definition in a dictionary are the confirmed parts of speech. Examples:(n. v. adj.) These abbreviations will be consistent in all dictionaries.
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Answer:
D. Hilary said that there must have been more than five thousand people at the stadium.
Explanation:
If the number is rounded or estimated, spell it out.
C is wrong because numbers higher than 99 do not need a hyphen.
Answer:
A. The cause-and-effect structure emphasizes the fact that hard work is responsible for improved test scores.