The missing words are "Scared", "Fatherly". Hence the complete sentence is:
Even though the football coach always scared new recruits with his tough approach, older players knew him to be fatherly and kind hearted.
Missing words can be detected using context clues. Context clues are clues that help the reader to identify the meaning of a word or that which is missing.
Hence, it is correct to state that the complete sentence is:
Even though the football coach always scared new recruits with his tough approach, older players knew him to be fatherly and kind hearted.
Learn more about missing words at;
https://brainly.com/question/3955543
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