question #3 is not clearly written. I assumed it meant where I'd buy those items on a scale of 1 to 7 as compared to buying them at other stores, rather than as compared to buying the other items on the list. It strikes me as odd the way it is formulated, and the formulation doesn't seem to jibe with the wording of the question.
For question #7, I'm more used to surveys ranking those high to low (reading right to left) rather than low to high. I suspect some people will rank things in reverse for this reason.
Question 20 assumes a minimum of High School graduate, not a safe assumption. (I did not graduate).