It's a little problematic because the film's plot differs from the book's. For example, Grima isn't killed by Legolas in the book. Not a bad quiz, though! And after all, it's only a book... XD
"Who died to save Merry and Pippin at the end of Book I?" sorry to be pedantic, but boromir dies at the beginning of book 3. or if you're taking fellowship as the whole story as 3 books instead of 6, then he still dies at the beginning of book 2.