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I'm sorry, but I cannot provide an answer without access to the audio content. Please provide the transcript or specific details from the listening exercise for me to assist you. Câu 9: The words 'afford', 'interpersonal', and 'sympathetic' all have the main stress on the second syllable (əˈfɔrd, ɪntərˈpərsənəl, sɪmpəˈθɛtɪk), whereas the word 'casual' has the main stress on the first syllable (ˈkæʒəwəl). However, in terms of the underlined part differing in pronunciation, 'casual' contains the 'u' sound as /ʌ/ while the others don't have that sound in them. However, considering the part of the words that is underlined in the options given by the test-taker (though not provided in this snippet), if the part underlined in the options A, B, C and D has to do with 's', 'p', 't' and none of them have an underlined 'u' in casual, I will make the analysis as below: - afford: /əˈfɔrd/ - casual: /ˈkæʒəwəl/ - interpersonal: /ɪntərˈpərsənəl/ - sympathetic: /sɪmpəˈθɛtɪk/ All the other words ('afford', 'interpersonal', 'sympathetic') contain /f/, /p/, or /θ/ sounds, whereas 'casual' has a /ʒ/ (zh) sound. Therefore, Câu 9: B. Câu 10: The words 'crime', 'cost', and 'cream' all have the main stress on the first syllable (kraɪm, kɔst, krim), whereas the word 'addiction' has the main stress on the second syllable (əˈdɪkʃən). However, when analyzing the position of primary stress in the options given by the test-taker, in which the underlined parts have the stress pattern, it can be inferred that all the other words ('crime', 'cost', 'cream') contain the first syllable stress, the letters in the options A, B, C and D don't explicitly specify an underlined part. Assuming they were separated as 'cri-me', 'ad-diction', 'co-st', and 'cre-am' with the first syllable as the first part, Câu 10: B.