Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.
My head teacher has grave doubts as to whether I would pass my university entrance examination. I myself feel so worried.

A. personal

B. serious

C. private

D. specific

Hiđrocacbon X có công thức phân tử C₆H₁₀. X tác dụng với dung dịch AgNO₃/NH₃ tạo ra kết tủa vàng. Khi hiđro hóa hoàn toàn X thu được neohexan. Tên gọi của X là?

A.2,2-đimetylbut-3-in

B.2,2- đimetylbut-2-in

C. 3,3- đimetylbut-1-in

D. 3,3-đimetylpent-1-in

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.

A. introduces

B. Leaves

C. Practices

D. wishes