a few links about prepositions...

"Here is a list of common words that can be used as prepositions: about, above, across, after, against, along, among, around, at, before, behind, below, beneath, beside, besides, between, beyond, but (when it means except), by, concerning, down, during, except, for, from, in, inside, into, like, near, of, off, on, out, outside, over, past, since, through, to, toward, under, until, up, upon, with, within, and without."



Online worksheet: multiple choice
http://www.usingenglish.com/handouts/231.html
Same website offers more practice on prepositions, as well as other grammar forms. View them in the online quiz format and get instant assessment results.