Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the three in the position of primary stress in each of the following questions

Câu 17 : Mark the word that differs from the three in the position of primary stress: calculation, photography, economics, conservation.

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Câu 18 : Mark the word that differs from the three in the position of primary stress: doctor, birthday, concert, address.

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