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The relative clause 'who loves America' requires a nominative pronoun as its subject, making 'he' grammatically correct. However, this question has a significant limitation: it defines 'American' using a gendered pronoun ('he'), which excludes women and non-binary individuals from the definition. Modern English usage would prefer 'someone' or restructure to avoid gender bias.

This construction uses a possessive pronoun at the end of a sentence following 'isn't'. The correct form is the possessive pronoun 'mine' (absolute possessive), which functions as a pronoun itself rather than modifying a noun. The phrase 'isn't mine' expresses non-ownership correctly, whereas 'me' would be grammatically incorrect in this context.

The pronoun in this sentence is part of the compound object 'her and her brother' following the verb 'invite'. Objects of transitive verbs require objective case pronouns. 'Her' is correctly in the objective case as it receives the action of inviting. The structure 'invite [object]' requires both components of the compound object to be in objective form.

This sentence contains two clauses requiring nominative case pronouns. The first blank 'he' serves as the subject of 'will suffer' in the clause 'it won't be he who will suffer'. The second blank 'I' functions as the subject complement after 'it will be'. Both positions require nominative case because they are subjects or subject complements, not objects.

The construction 'everyone...except _______' uses 'except' as a preposition introducing an exception to the subject. In this context, the pronoun is in the objective case as the object of the preposition 'except'. The complete subject is 'everyone', and 'except her' specifies who is excluded from that group, requiring objective case.

The clause 'Mike _____ is the leader...' has Mike as the subject of 'is'. When the relative pronoun is the subject of its own clause, we use the subject form 'who'. The complete thought is 'Mike is the leader', so 'who' is correct.

The underlying structure is 'Truman appointed [J.A. Krug]'. J.A. Krug is the object of 'appointed', so we need the object form 'whom'. Test by converting to statement: 'Truman appointed whom' → 'whom' is correct.

The clause is 'many people consider [Dr. Joseph] is one of the ablest speakers'. Dr. Joseph is the subject of 'is', so we need the subject form 'who'. Test by converting to statement: 'Many people consider [that] who is...' → 'who' functions as subject.

The underlying structure is 'you think you are [who]'. The pronoun functions as the subject complement after 'are', which requires the subject form 'who'. Test: 'You are who' not 'You are whom'.

The underlying structure is '[someone] would be you'. The pronoun functions as the subject of 'would be', requiring the subject form 'who'. Test: 'Who would be you' makes sense as a subject-focused question.

The clause is '[the executive] did not wish to be quoted'. The pronoun is the subject of 'did wish', requiring the subject form 'who'. The phrase 'we understand' is parenthetical and doesn't change the case.

The underlying structure is 'you think he is [who]'. The pronoun functions as the subject complement after 'is', which requires the subject form 'who'. Test: 'He is who' is the correct structure.

The underlying structure is 'you love [someone] best'. The pronoun is the object of the verb 'love', requiring the object form 'whom'. Test: 'You love whom' - object position needs 'whom'.