Đạo hàm của y=1-2x2 là
A. y'=121-2x2.
B. y'=-4x1-2x2.
C. y'=-2x1-2x2.
D. Một kết quả khác.

Choose the best answer for the following sentence:
Did you say that you _______________ here only three days ago? 
A. came   
B. have come   
C. had came   
D. come

Choose the best answer for the following sentence:
Vietnam recommended archery, vovinam, billiards-snooker and canoeing _____________ official sports at the games. 
A.  at              
B. with             
C. as                       
D. in

Choose the best answer for the following sentence:
The bee will never bite you if you _____________ it. 
A. don’t annoy               
B. wouldn't annoy
C. didn't annoy                   
D. hadn't annoyed

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.