While they_____ dinner, the doorbell rang.

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.

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.

The rapid advancement of technology in recent years has revolutionized the way we communicate. The synonym of "rapid" is_______

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.

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.

What is the main idea of the passage?