Với giá trị nào của m thì phương trình ${{x}^{2}}-mx+4=0$ có nghiệm kép:
A. m = 4
B. m = – 4
C. m = 4 hoặc m = – 4
D. m = 8

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

Choose the best answer for the following sentence:
A ____________ is a special place in which vou remember and praise a famous person, who was dead.  
A. capital                     
B. garden                   
C. shrine                  
D. site

Choose the best answer for the following sentence:
Mai: “Did you revise our Geography lessons?”
Tuan: “No, I ____________ it.”
A. am checking 
B. to check 
C. check 
D. checked

Find a mistake in the four underlined parts of the sentence and correct it:
That's the man who daughter is studying with me.
A. That's
B. who
C. is studying
D. with

Choose the best answer for the following sentence:
_____________ Mr. Le was rich, he wasn’t a happy man in all his life.
A. However 
B. Therefore
C. Because 
D. Although

Choose a word that has different stress pattern:
entrapment                   encouragement                  ensure                   engineer
A. entrapment                   
B. encouragement                  
C. ensure                   
D. engineer

Choose the word that has the underlined part pronounced differently from the rest:  
dinner                  drink                  dive                     children
A. dinner                  
B. drink                  
C. dive                     
D. children

Choose a word that has different stress pattern:
barbecue                     government                     discover                    beautiful
A. barbecue                     
B. government                     
C. discover                   
D. beautiful

Choose the correct sentence which is built from the words and phrases given:
Observers / living / Beijing / say / appear / only / small part / one million / habitants/ escape / death / injury//.
A. Observers living in Beijing said it appeared that only a small part of the one million inhabitants escaped from death or injury.
B. Observers are living in Beijing said that it appeared when only a small part of the one million inhabitants escaped from death and injury.
C. Observers were living in Beijing say it appeared that only a small part of the one million inhabitants escaped out of death or injury.
D. Observers who living in Beijing said that it appeared that only a small part of the one million inhabitants escaped from death or injury.