Khi có ánh sáng và giàu CO2, một loại vi sinh vật có thể phát triển trên môi trường với thành phần được tính theo đơn vị g/l như sau: (NH4)3PO4­, KH2PO4 (1,0) ;  MgSO4(0,2) ; CaCl2(0,1) ; NaCl(0,5). 
Nguồn cacbon của vi sinh vật này là       
A. chất hữu cơ.
B. chất vô cơ.
C. CO2.
D. cả A và B.

Cho sơ đồ giải phóng năng lượng ở vi sinh vật sau đây:
Chất cho electron là chất hữu cơ Chất nhận electron cuối cùng là chất hữu cơ
(A?) là quá trình
A. lên men.
B. hô hấp kị khí.
C. hô hấp hiếu khí.
D. hoá dưỡng vô cơ.

Choose a word that has different stress pattern:
believe                 message               control              consult
A. believe               
B. message               
C. control        
D.  consult

Choose the correct sentence which is built from the words and phrases given:
exhausted batteries / dispose off / a special container / they / consider / toxic waste.
A. The exhausted batteries should be disposed off in a special container because they are considered to be toxic waste.
B. The exhausted batteries should be disposed off in a special container therefore they are considered to be toxic waste.
C. The exhausted batteries should be disposed off in a special container although they are considered to be toxic waste.
D. The exhausted batteries have been disposed off in a special container as soon as they are considered to be toxic waste.

Choose one sentence that has the same meaning as the root one:
He now goes to work on his bicycle instead of by car.
A. He still goes to work by car but more often on his bicycle.
B. He has now stopped driving to work and goes by bicycle.
C. He has never gone to work in his car but always on his bicycle.
D. Since he bought the car, he has never used the bicycle to go to work.

Choose the best answer for the following sentence:
By the time the boss returned, _______________.
A. she would type all the letters 
B. all the letters was typed
C. she had typed all the letters 
D. all the letters will have been typed

Choose the best answer for the following sentence:
You really _________ stop smoking, you know. It's bad for you. 
A. must   
B. should   
C. ought   
D. would

Choose the correct sentence which is built from the words and phrases given:
Why / you / join / us / this trip / ? //.
A. Why not you join us in this trip?
B. Why don’t you join in us in this trip?
C. Why don’t you join with us in this trip?
D. Why don’t you join us in this trip?

Choose the word that has the underlined part pronounced differently from the rest:
trophy                      women                      control                    most
A. trophy                      
B. women                      
C. control                    
D. most

Find a mistake in the four underlined parts of the sentence and correct it:
When he was at secondary school, he won first price for good behavior.
A. was
B. secondary
C. first
D. price