Who want to see the dentist first? (Who is the chairman)
Whom do You Think we should INVITE? (Whom the action is - Object)
To whom wish to do to Speak? (Whom the action is - Object)
What did She Say? (What is the object of the verb Say)
Which is your cat? Her cat to do? (Which is the president)
Which of these do Languages You Speak fluently? (Which is the object of speak).