Pronoun/Antecedent Agreement

Hi, I am being driven nuts by trying to figure out which term to use...I'm sure I'm overthinking this, but if someone could look over the following sentences and let me know if they're right, I'd appreciate it. These are the ones I'm stuck on:

1. They are seeking applicants (whom, who) they can train quickly. (whom - I phrased it as "they can train them quickly")
2. The attorney (who, whom) we consulted gave us the same advice. (whom - "we consulted him" ?)
3. She said (whoever, whomever) is trained in that area will be hired for the job. (whoever - "he will be hired for the job" )
4. None of us knew (who, whom) she brought to the lecture. (whom - "she brought him to the lecture")
5. (Who, Whom) have you seen lately for guidance counseling? (Whom - "you have seen him lately...")
6. It was she, (who, whom) I believe, sent the letter. (who - "she sent the letter")
7. Katrina is going to be working with Gary or with (whoever, whomever) the teacher assigns. (whomever - "the teacher assigns him")
8. (Whom, Who) did they finally select for the job? (Whom - "they selected him for the job")

My text book advises that who/whoever is used if you can substitute I, we, he, she or they in the clause beginning with who or whoever. Whom/whomever is used when if you can use me, us, him, her or them - it suggests using just him and them as the substitute words, which is what I did when trying to figure out which word to use. What SOUNDS good to me may not (and probably is not) the correct answer, .

Thanks to those that can look this over for me!