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11) \(\frac{3}{\sqrt{6}-\sqrt{3}}+\frac{4}{\sqrt{7}+\sqrt{3}}\)

12) \(\frac{6}{3\sqrt{2}+2\sqrt{3}}\)

13) \(\left(\sqrt{75}-3\sqrt{2}-\sqrt{12}\right)\left(\sqrt{3}+\sqrt{2}\right)\)




17) \(\frac{1}{4-3\sqrt{2}}-\frac{1}{4+3\sqrt{2}}\)
















Được cập nhật 8 phút trước 3 câu trả lời

IV. Choose the best answer by circling the letter A, B, C or D.

1. Lan _________ English for more than a year but she can speak it very well.

A. learns B. learn C. learned D. has learned

2. The beans _________ before being cooked.

A. are cleaned

B. is cleaned

C. clean

D. cleaned

3. Christmas is an important _________ in Europe.

A. competition

B. festival

C. souvenir

D. contest

4. We are all _________ that you passed your English exam. Congratulation!

A. relieved B. afraid C. delighted D. certain

5. Can you tell me where _________?

A. she does B. does she C. she is D. is she

6. You have to work _________ for the coming exam.

A. hardly B. more hardly C. more hard D. hard

7. You should watch less TV because looking at screen for too long _________ your eyes.

A. hurt B. hurts C. is hurting D. to hurt

8. Lan promises to _________ her best in learning English.

A. try

B. make

C. work

D. learn

9. Go Green _________ people to recycle rubbish, such as glass, cans and paper.

A. to encourage B. encourage C. encouraged D. has encouraged

10. Be a Buddy has _________ education for street children.

A. given B. spent C. provided D. helped

11. Smoking is harmful _________ your health.

A. on B. for C. about D. to

12. Do you find anything _________ there?

A. interested B. useful C. bored D. easily

13. Ann is very busy these days. She has _________ free time.

A. a little B. few C. a few D. little

14. A new shopping is _________ in my neighborhood today.

A. being opened B. opened C. opening D. be opened

15. Please ask them _________ in this area.

A. don’t smoke B. not smoking C. to not smoke D. not to smoke

16. A(n) _________ can take a patient to hospital quickly.

A. emergency B. bleeding C. wound D. ambulance

17. “Would you like to go to the movie with me tonight?” - “ _________.”

A. I’m sorry. I’d love to. B. Yes, please. C. No, thanks. D. Yes, I’d love to.

18. There is a detective film _________ at the Thang Long Theater.

A. on B. in C. inside D. outside

19. She got used to _________ her bike.

A. ride B. riding C. rode D. rides

20. Ha Long Bay is a _________.

A. World Natural Heritage. B. Natural World Heritage.

C. World Cultural Heritage. D. Cultural World Heritage.

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