Tìm  để các hàm số  liên tục tại  
A.  
B.  
C.  
D. 1

Hàm số f(x)=x2-16x-4 khi x≠48 khi x = 4liên tục trên
A. R.
B. R\{4}.
C. (0; +∞).
D. a, b, c đều đúng.

Kết quả của giới hạn $\displaystyle \lim \frac{{{3}^{n}}-1}{{{2}^{n}}-{{2.3}^{n}}+1}$ bằng 
A. $\displaystyle -1.$ 
B. $\displaystyle -\frac{1}{2}.$ 
C. $\frac{1}{2}.$ 
D. $\displaystyle \frac{3}{2}.$

Giá trị của giới hạn $\lim \left( \sqrt{2{{n}^{2}}-n+1}-\sqrt{2{{n}^{2}}-3n+2} \right)$ là
A. $0.$ 
B. $\frac{\sqrt{2}}{2}.$ 
C. $-\infty .$ 
D. $+\infty .$

Choose the correct sentence which is built from the words and phrases given:
police / asking / man / house / break into / last night.
A. The police is asking the man having the house broken into last night.
B. The police are asking the man whose house was broken into last night.
C. The police is asking the man into whose house was broken last night.
D. The police are asking the man whose house broken into last night.

Choose the word that has the underlined part pronounced differently from the rest:
sun             sure              success            sort
A. sun            
B.  sure              
C. success            
D. sort

Choose the best answer for the following sentence:
Jim is a kind of person ____________ whom one can talk about anything.  
A. with            
B. at               
C.  to            
D. in

Choose one sentence that has the same meaning as the root one:
She is very shy; that’s why she doesn't enjoy parties. 
A. If she weren’t shy, she would enjoy parties.
B. If she isn’t very shy, she will enjoy parties.
C. If she hadn’t been too shy, she would have enjoyed parties
D. She said that if she wasn't very shy, she would enjoy parties.

Find a mistake in the four underlined parts of the sentence and correct it:
The ladder which I was standing began to slip.
A. which
B. was
C. began
D. to slip

Choose a word that has different stress pattern:
invent                  device                     perform                     postal
A. invent                 
B.  device                    
C.  perform                    
D.  postal