1. Put the words into two group (/i:/ and /I/) friendship historic busy sleepy police river peaceful convenient exciting beach sea village street leave sit city milk teen thing slim cheap meal music see
/i:/ : sleepy , police , peaceful , beach , sea , street , leave , teen , cheap , teen , meal , see
/I/ : busy , friendship , historic , river , convenient , exciting , village , sit , city , milk , thing , slim , music