Tích phân $I=\int\limits_{0}^{\frac{1}{\sqrt{3}}}{\frac{{{x}^{8}}}{{{({{x}^{4}}-1)}^{2}}}dx}$ bằng
A. $\frac{1}{\sqrt{3}}+\frac{1}{4}\ln \frac{\sqrt{3}-1}{\sqrt{3}+1}+\frac{\pi }{12}-1.$ 
B. $\frac{1}{\sqrt{3}}+\frac{1}{4}\ln \frac{\sqrt{3}-1}{\sqrt{3}+1}+\frac{\pi }{12}.$ 
C. $\frac{1}{\sqrt{3}}+\frac{1}{4}\ln \frac{\sqrt{3}-1}{\sqrt{3}+1}+\frac{\pi }{12}-12.$ 
D. $\frac{1}{\sqrt{3}}+\frac{1}{4}\ln \frac{\sqrt{3}-1}{\sqrt{3}+1}+\frac{\pi }{12}-2.$

Tích phân $I=\int\limits_{0}^{\frac{\pi }{4}}{\frac{\cos x}{{{(\sin x+\cos x)}^{3}}}dx}$ có giá trị bằng
A. $\frac{3}{8}.$
B. $-\frac{3}{8}.$
C. $\frac{8}{3}.$
D. $-\frac{8}{3}.$

Cho tích phân $I=\int\limits_{0}^{\frac{\pi }{4}}{(1+\frac{1}{{{\cos }^{2}}x})dx}=a.\pi +b.$ Khi đó tổng a+2b bằng
A. $\frac{9}{2}.$
B. $9.$
C. $\frac{9}{4}.$
D. $\frac{9}{8}.$

Choose one sentence that has the same meaning to the root one:
By the time we arrived, all the students in my class had left.
A. All the students in my class had left before we arrived.
B. All the students in my class were leaving when we arrived.
C. All the students in my class was leaving when we were arriving.
D. After we arrived, all the students in my class had left.

Choose the word that has the underlined part pronounced differently from the rest:
admission           television               tension             commission
A. admission           
B. television              
C. tension             
D. commission

Choose the best answer for the following sentence:
She has a very big house in __________ Salt Lake City is __________ capital of Utah. 
A. the / a                 
B. Ø / the                  
C. the / Ø               
D. Ø / a

Choose the best answer for the following sentence:
It’s kind of you _____________ me with my homework.
A.  help 
B. to help
C. helping 
D. to helping

Choose the best answer for the following sentence:
What a ___________ piece of music she is playing!
 
A. love                
B. loved                
C. loveable                   
D. lovely

Choose the word that has the underlined part pronounced differently from the rest: 
condition                    general                     professor                      another
A. condition                    
B. general                     
C. professor                      
D. another

Choose the word that has the underlined part pronounced differently from the rest:
arrive                    exciting                         community                         nice
A. arrive                    
B. exciting                         
C. community                         
D. nice