1. The problem is to choose the correct relative pronoun or conjunction to complete sentences correctly. 2. The key rule is that "whose" is used to show possession, "when" is used for time, "to whom" is used for indirect objects, and "who" or "that" are used for subjects or objects in relative clauses. 3. Let's analyze the first question: "My professor, ________ was published last month, is a very dedicated professional." - Option a: "his book" is incorrect because it is a possessive pronoun phrase, not a relative pronoun. - Option b: "whose book" is correct because "whose" shows possession related to the professor. - Option c: "of whom the book" is awkward and incorrect. - Option d: "which his book" is grammatically incorrect. 4. Therefore, the correct answer is **b. whose book**. Final answer: **b. whose book**