I. Choose the word whose underlined part has a different pronunciation from the others in each group: 11/ A. technology B. different C. mental D. dentist 15/ A. magazine B. device C. live D. unit 20/ A. treated B. asked C. sacred D. suggested II. Choose the word whose main stress is placed differently from the others in each group: 11/ A. community B. developing C. conditioner D. interested 12/ A. county B. mention C. disease D.luggage 13/ A. continue B. importance C. different D. directed 14/ A. medicine B. opposite C. pollution D. capable 15/ A. collapse B. healthy C. dislike D. appear 16/ A. solution B. perfection C. atmosphere D. departure 17/ A. present B. perfect C. prefer D. future 18/ A. tissue B. repeat C. windy D. nation 19/ A. retell B. lengthy C. city D. return 20/ A. useful B. result C. agree D. begin mọi người giúp em với! làm ơn đấy ạ! 2h30 em phải nộp rồi! nốt cái này thôi ạ! làm ơn! em cầu xin đấy ạ!