文档介绍：.(动名词作主语),youngadultswillexposethemselvestovariouschallengesanddifficulties.(介词+动名词).(进行).(分词修饰名词),.(分词短语结尾补充),however,-sexeducation,whileinothersbothsinglesexandmixedschoolsco-,however,,,estarsandcelebrities,,+?Whatsolutionscanyousuggest?PoorstudentbehaviourseemstobeanincreasinglywidespreadproblemandIthinkthatmodernlifestylesareprobablyresponsibleforthis.