Với giá trị nào của m thì phương trình ${{x}^{2}}-2x+3m-1=0$ có nghiệm ${{x}_{1}};{{x}_{2}}$thoả mãn ${{x}_{1}}^{2}+{{x}_{2}}^{2}=10$
A. $m=-\frac{4}{3}$
B. $m=\frac{4}{3}$
C. $m=-\frac{2}{3}$ 
D. $m=\frac{2}{3}$

Cho phương trình $2{{x}^{2}}+2\sqrt{6}x+3=0$ phương trình này có :
A. Vô nghiệm
B. Nghiệm kép
C. 2 nghiệm phân biệt
D. Vô số nghiệm

Phương trình ${{x}^{2}}-6x-1=0$ có biệt thức $\Delta $‘ bằng:
A. -8
B. 8
C. 10
D. 40

Phương trình ${{x}^{2}}+x+1=0$ có tập nghiệm là :
A. $\left\{ -1 \right\}$ 
B. $\varnothing $
C. $\left\{ -\frac{1}{2} \right\}$ 
D. $\left\{ -1;-\frac{1}{2} \right\}$

Choose the correct sentence which is built from the words and phrases given:
Sea turtles / turtles / find / all the world's oceans / except / Arctic Ocean //.
A. Sea turtles are turtles finding in all the world's oceans except the Arctic Ocean.
B. Sea turtles are turtles found in all the world's oceans except for the Arctic Ocean. 
C. Sea turtles are turtles found in all the world's oceans except the Arctic Ocean.
D. Sea turtles are turtles found on all the world's oceans except the Arctic Ocean.

Find a mistake in the four underlined parts of the sentence and correct it:
An has been sleeping for two hours what the telephone rang.
A. has been sleeping
B. for
C. what
D. rang

Choose the best answer for the following sentence:
The first term is coming to _____________ and my school is going ___________ some days off.
A. an end - to have               
B. end - having
C. a end - have                
D. an end - have had

Choose a word that has different stress pattern:
highlands                     product                  culture                   exist
A. highlands                    
B. product                  
C. culture                        
D. exist

Choose the best answer for the following sentence:
____________ is the distance from here to the airport?
A. What 
B. How 
C. How far
D. How long

Choose the best answer for the following sentence:
Please be quiet while the teacher ___________ the lesson.
A. explains            
B. was explaining                  
C. is explaining                   
D. explained