1) Among the books, only one is missing. 2) There are a lot of students who score full marks and one of them is john. Hope this helps...
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kindaichi0001) One of the books has been missing."One of the books" is singular (it's referring to one book), so it must be "has".
kindaichi0002) One of the most intelligent students who score full marks is John.You can look at this sentence in two ways: