Unit 1Part onepreparation1.step oneparentchild employeremployee clerkcustomerhusbandwife writereader driverpassengerteacherstudent hostguest buyersellerdoctorpatient boyfriendgirlfriend performeraudiencestep twoco-workers,colleagues,classmates,roommates,schoolmates,seatmates,playmates,lovers,supervisor,neighbors,co-author.Part twopost-readingReading Comprehension1. (1) A B A A B (6)CAC2. 1)killed 2)wounded 3)arrived 4)