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.

"Why don't you take extra classes in English if you want to become a tourist guide?" said my friend.

A. My friend advised me to take extra classes in English only if I wanted to become a tourist guide. 

B. In my friend's opinion, I will never become a tourist guide if I don't take extra classes in English. 

C. In my friend's opinion, taking extra classes in English is necessary if I wanted to become a tourist guide. 

D. My friend suggested I take extra classes in English if I wanted to become a tourist guide.

Hợp chất X có CTCT CH₃CH₂COOCH₃. Tên gọi của X là 

A. vinyl fomat

B. etyl propionat.

C. metyl propionat.

D. metyl metacrylat.

Biết rằng các electron của nguyên tử X được phân bố trên ba lớp electron (K, L, M), lớp ngoài cùng có 6 electron. Số  electron ở lớp L trong nguyên tử X là

A. 4

B. 6

C. 8

D. 10