Mark the letter A, B, C, or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.

‘‘Do you know how to start this computer?’’

‘‘_______________________’’.

A. Just press the green button

B. These computers are good

C. Sure, go ahead

D. You know, yeah

______ I had learnt English when I was at high school.

A. If only   

B. Even if  

C. Unless    

D. If

Tìm các đạo hàm sau:  y   =   - x 2   +   7 x   +   5 x 2   -   3 x

Chọn sơ đồ điều chế axit axetic là

A.  C 2 H 2 → C 2 H 5 Cl → C 2 H 5 OH → CH 3 COOH

B.  CH 4 → C 2 H 2 → CH 3 CHO → CH 3 COOH

C.  CH 4 → C 2 H 4 → C 2 H 5 OH → CH 3 COOH

D.  CH 4 → C 2 H 6 → CH 3 CHO → CH 3 COOH

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

When I picked up my book I found that the cover had been torn

A. Picking up my book, the cover had been torn 

B. On picking up the book, I saw that the cover had been torn 

C. Picked up, I saw that the cover of the book was torn 

D. The cover had been torn when my book picked up

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 the primary stress in each of the following questions

A. discovery

B. simplicity

C. difficulty

D.  

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.

Children subjected to violence, exploitation, abuse and neglect are in risk of death, poor physical and mental health, HIV/AIDS infection, and educa­tional problems

A. subjected to

B. abuse

C. in

D. HIV/AIDS infection