The words "at," "by" and "of" all belong to which part of speech?

At an Oxford track meet on May 6, 1954, Roger Bannister became the first person to cover which distance in under four m… At the 1920 Antwerp Olympics, where the Olympic flag debuted, which birds were first released as symbols of peace? In 1314, which Scottish king defeated a much larger English army at Bannockburn, near Stirling Castle? Binion's casino in Las Vegas once displayed 100 $10,000 bills bearing the portrait of which New Hampshire native? At a wedding in Cana, Jesus performed his first miracle by doing what? At Christmas 1965, which British band reached No. 1 in the U.S. with "Over and Over," its only American chart-topper? At the Council of Clermont in 1095, Pope Urban II proclaimed the first of which holy wars? In 1999, which star's gown, worn to serenade JFK in 1962, sold for about $1.3 million, then a record for a dress?