1. I’m pleased __________ you are working hard.

            A. to                                        B. that                        C. if                            

2. An ​extremely ​large ​wave ​caused by a ​violent ​movement of the ​earth under the ​sea is called a _______.

A. tsunami                             B.  cyclone                C. hurricane                          D. tornado

3. Consumers now want products that will not only work ________, but also save money.

            A. effective                            B. effectively                      C. hardly

4. He’s never been to England, __________?

           A. is he                                              B. has he                   C. hasn’t he

5. - “Could you do me a favor, please?    - “_____________________”

    A. Let me help you.                        B. Yes, go ahead!        C. Sure. What can I do for you?

6. He asked me _____________ .

 A. what my phone number is    B. what was my phone number    C. what my phone number was

7. ''I suggest fixing the dripping faucet''

            A. we will                               B. Good idea                         C. Yes, please         

8. Don't.......... your time trying to convince Mary. She's made up her mind.

A spend                            B throw                                     C    waste                  

9. I'll phone you as soon as I........ to Ho Chi Minh City.

A reach                            B. arrive                                          C. get                           

10. What………………….of learning English do you find most difficult ? “ pronunciation ” 

            A. section                         B. aspect                                     C. hobby 

11. My brother ________ playing basketball five years ago.

            A. starts                            B. started                                        C. had started

12. ..............weather ! We can't go out for a walk now.

A. How terrible               B. What terrible                      C. How a terrible        

13.Will it rain on the day of our departure? - _____________________

            A. I hope not.                    B. I don’t hope so           C. I hope not so.                  

14.Would you mind if I close the window? - ___________________________

            A. Yes, I wouldn’t mind.         B. No, don’t close it.     C. No, please do.                   

15. Have you ever met the man ________ Mary’s cousin?

A. who married         B. who is married                 C. whom married                 

Giải phương trình:

\(8\left(x+\dfrac{1}{x}\right)^2+4\left(x^2+\dfrac{1}{x^2}\right)^2-4\left(x^2+\dfrac{1}{x^2}\right)\left(x+\dfrac{1}{x}\right)=\left(x+4\right)^2\)

Giải phương trình \(\dfrac{x-1}{x+1}-\dfrac{x-2}{x-3}+\dfrac{14}{x^2-2x-3}=0\)

Cho a,b là các số hữu tỉ thỏa mãn \(a^3+b^3\)=4ab. Cmr 4-ab là bình phương của một số hữu tỉ