Those two cars are really the same. I don't know which/whose is Adam's.
He is the most brilliant boy that/whom I ever met.
Those two cars are really the same. I don't know which is Adam's. He is the most brilliant boy (that) I've ever met.
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Those two cars are really the same. I don't know which is Adam's.
He is the most brilliant boy (that) I've ever met.