如图所示,(1)∠AED和∠ABC可看成是直线______、________被直线_______ 所截得的________角;(2)∠EDB和∠DBC可看成是直线______、________被直线_______ 所截得的________角;(3)∠EDC和∠C可看成是直线 ______、________被直线_______ 所截得的________角;