I can't find the letter I received from my boss some days ago. I might have thrown them into the trash bin yesterday.

The passage mainly discusses ________

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions from 15 to 16.

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions from 15 to 16.

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions from 47 to 50.

Mark the letter A, B, C, or D on your answer sheet to indicate the word or phrase that best completes each of the following questions from 45 to 46.

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions from 21 to 24.