Với hàm số y=-2x4+3x3-x+2 thì y' là
A. -8x2+9x-1.
B. -16x3+9x-1.
C. -8x3+27x2-1.
D. -18x3+9x2-1.

Choose the best answer for the following sentence:
Weekend in my family is the time when mother and daughter cook meals whereas father and son _________ broken things around the house. 
A. make             
B. mend                 
C. correct                 
D. repair

Choose the best answer for the following sentence:
She waited _________________. 
A. at the airport anxiously for 5 hours
B. for 5 hours anxiously at the airport
C. at the airport for 5 hours anxiously
D. anxiously at the airport for 5 hours

Choose the best answer for the following sentence:
___________ you open the window, please? It is so hot in here. 
A. May                
B. Might               
C. Could                  
D. Need

Choose the best answer for the following sentence:
If there __________, the rice fields could have been more productive. 
A. had been enough water               
B. were enough water
C. would be enough water                 
D. are enough water

Lực lượng nghĩa quân nào ở Việt Nam đã liên kết với nghĩa quân của Pucômbô?
A. Trương Định, Võ Duy Dương (Thiên hộ Dương).
B. Trương Định, Nguyễn Hữu Huân (Thủ khoa Huân).
C. Trương Quyền, Võ Duy Dương (Thiên hộ Dương).
D. Trương Quyền, Nguyễn Trung Trực.

Choose the best answer for the following sentence:
Robert does not have _____________ Peter does.
A.  money more than                   
B. as many money as
C. more money as                 
D. as much money as

Choose the best answer for the following sentence:
Alexis _____________________ next week. 
 
A. is swimming in the state championship                  
B. is swimming the state championship
C. is swum in the state championship               
D. is swum the state championship

Choose the best answer for the following sentence:
At present, I ___________  afford to go to the cinema twice a week.
A. can’t         
B. must not          
C. couldn’t                
D. might not

Choose the best answer for the following sentence:
Joe seemed to be in good mood, _________ he snapped at me angrily when I asked him to join us. 
A. yet               
B. so                
C.  for               
D. and