Mark the letter A, B, C, or D on your answer sheet to indicate the word that is OPPOSITE in meaning to the underlined part in the following questions.

In Western culture, it is polite to maintain eye contact during conversation.

A. irresponsible

B. discourteous

C. insecure

D. informal

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

As children we were very close, but as we grew up we just drifted apart

A. not as friendly as before 

B. not as serious as before 

C. not as sympathetic as before 

D. not as childlike as before 

good luck to you

cảnh ở đâu vậy bạn

Giải phương trình 5x2 + 4x – 1 = 0 bằng cách điền vào những chỗ trống:

a = …;        b’ = …;        c = …;

Δ’ = …;        √(Δ') = ….

Nghiệm của phương trình:

x1 = …;        x2 = ….

Cho các chất: HCHO, CH₃COOH, CH₃COOC₂H₅, HCOOH, C₂H₅OH, HCOOCH₃. Số chất có khả năng tham gia phản ứng tráng bạc là

A. 4

B. 5

C. 3

D. 6

Trong phản ứng  MnO 2 + 4 HCl → MnCl 2 + Cl 2 + 2 H 2 O  HCl đóng vai trò là

A. chất khử

B. axit mạnh 

C. axit yếu

D. chất oxi hóa

Chất X có công thức: CH₃-CH(CH₃)-CH=CH₂. Tên thay thế của X là

A. 3-metylbit-1-in

B. 3-metylbut-1-en

C. 2-metylbut-3-en. 

D. 2-metylbut-3-in

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

It ______ Sue that you saw last night. She’s abroad with her family.

A. should have been

B. must have been

C. can’t have been

D. needn’t have been