I've been looking at various study materials from the PRAXIS I test, which I'll be taking soon. I find, many questions seem to have multiple correct answers by my figuring, however, the practice tests have only 1 choice. Here is just 1 example, but they seem to be all over in the tests: I ate 1 slice of pizza, 2 bowls of pudding, and 1 carrot. I ate 1 slice of pizza, 2 bowls of pudding and 1 carrot. How do I know which answer is correct and which not? If you talk to different people, they'll all give different answers, and if you talk to enough people, eventually that makes all of the answers correct, right? There are all sorts of books published on "correct grammar", written by so-called authorities on the matter, but I find their contents are all different. Since English doesn't have any official regulating body, who is ETS to say which way is correct and which way is not? Whose grammar should I study in preparing for this test?