• to arise from, to arise, arose, arisen, to be derived, to derive, to follow, to follow from, to issue, to proceed, to spring, sprang, sprung
• if an opportunity arises, if an opportunity presents itself
• sg is sure to turn up, sg will turn up
• a good opportunity presents itself
• something is sure to turn up, something will turn up
• it's a chance in a thousand
• it's the chance of a lifetime