Time prepositions:
http://www.helpforenglish.cz/article/2005121001-casove-predlozky-in-on-at-test
More phrases:
http://www.helpforenglish.cz/article/2008120601-grammar-theme-park-christmas-prepositions
http://www.helpforenglish.cz/article/2006121804-intermediate-prepositions-1