A. acid rain B. usually C. manufacturer D. potential A. empire B. slaughter C. drive mad D. in the afternoon A. to be honest B. proper C. triangle D. go home A. PC B. concoct C. exchange student D. have dinner A. go to bed B. downtown C. helpline D. vibration A. appreciate B. in the evening C. Dragon Boat Festival D. winter A. have lunch B. goodness C. headline D. the poor A. go to school B. angel C. painlessly D. famous A. sari B. homework C. day by day D. art form A. clatter B. spire C. worn-out D. in the morning