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17. "I hear you passed your exams. Congratulations!" Mark said to us.
Mark
congratulated...
18. "I'm afraid I've lost your letter, " Nam said to Lan.
Nam admitted
19. "Don't drink this water because it is very polluted, " Mai said to us
Mai warned
20. “You have just got a promotion, haven't you? Congratulation!"
Long said to his friend.
Long congratulated