Tìm x

a) 4x^2 - 20x +25 = 49

b)x^2(x-3)+3-x=0

c)(x+2)(x^2-2x+4)-x(x-1)^2=2x^2

d)(x+1)^3-(x-1)^3-6(x-1)^2

Để pha được 500 g dung dịch NaCl 8%, người ta cần trộn bao nhiêu gam dung dịch NaCl 10% và bao nhiêu gam dung dịch NaCl 5%?

IV. Choose A, B, C or D that best completes each sentence: 13. He somtimes …… to his facebook account to connect and chat with his parents and friends. A. uploads B. logs on C. Checks D. Browses 14. My father is very ………… so he can control the combine harvester very well. A. well-trained        B. surrounded C. relaxed               D. interested 15. Nowadays, teenagers are under a lot of …………………….at school. A. pressure B. activities C. leaders D. tests 16. My son is crazy …………… playing computer games A. in B. on C. at D. about 17. Nga likes ………….. crafts in her free time A. make B. making C. doing D. do 18. People in rural areas live……………than those in the city A. simpler B. simplier C. more simple D, more simply 19. Hoa did the test ………………. than I did. A. gooder B. more good C. well D.better 20. Coutryside is not polluted; ……………., you can breath the fresh air there A. because B. however C. therefore D. so 21. A: What a beautiful garden you have! B: …………………… A. I won't forget it. B. Thank you. C. It sounds interesting. D.You're welcome. 22. Jane: You really have a nice painting, John. - John: ……………………. A. I’m glad you like it, Jane. B. You're right C. Yes, please D. That's a good idea

VII. Choose the item among A, B, C or D that best answers the question about the passage Living in the country is something that people from the city often dream about. However, in reality, it has both advantages and disadvantages. There are certainly many advantages of living in the country. First, you can enjoy peace and quietness. Moreover, people tend to be friendlier. A further advantage is that there is less traffic, so it is safer for young children. However, there are certain disadvantages or drawbacks to life outside the city. First, because there are fewer people, you are likely to have few friends. In addition, entertainment is difficult to find, particularly in the evening. Furthermore, the fact that there are fewer shops and services so it is quite hard to find jobs. As a result, you may have to travel a long way to work, which can be extremely expensive. In conclusion, it can be seen that the country is more suitable for some people than others. On the whole, it is often the best place for those who are retired or who have young children. In contrast, young or single people who have a career are better provided for in the city. 32. According to the passage, living in the country has . A. both good and bad points B. only bad points C. only good points D. no disadvantages 33. How many advantages does living in the country have? A. Two B. Four C. Three D. No 34. Living in the country is safer for young children because . A. there are few shops B. there is less traffic C. there are fewer people D. there are few services 35. Having few friends is . A. one of drawbacks to life in the country B. the only disadvantage of living in the country C. one of certain advantages to life outside the city D. one of certain drawbacks to life outside the city

VI. Fill in each gap with suitable world. There is an extra world entertainment on hooked problems despite but A recent survey conducted by TIRA, a Vietnamese research company, highlights (27) ______ about the lifestyles of Vietnamese teenagers in urban areas. There is an imbalance in their consumption of time for studying and recreational activities. On average, these teenagers spend 9.5 hours a day (28) _____ studies at school and at home. They only have about four hours for (29) _____. Most of this time is spent on watching television and the internet, where they chat through social networks. The teenagers admit that they use computers to play games and to chat with friends much more than using it for studying purposes. The survey also s hows that during summer months, (30) ______ having much more free time than during school years, these teenagers still fail to manage their time properly. They stay in bed longer and then get (31) ______ to games and TV. The time for computers and TV increases significantly to about five or six hours a day, while there is almost no time for physical outdoor activities.

V. Find a mistake in each sentence below
23. He is fond in surfing the internet. He can sit in front of the computer all day
A B C D
24. 50 years ago, farmers depended more heavy on the weather than at present
A B C D
25. My sister often goes the library, because she loves read books.
A B C D
26. Lan hates talking face - to - face; otherwise, she enjoys chatting on faceboook.
A B C D

D. WRITING              I. Choose the underlined part that needs correction

33. She usually spend thirty minutes doing the shopping.

   A        B        C         D

34. Yesterday, they stayed at a childcare and help the disabled kids

          A      B                             C              D

35. She enjoys to build doolhouses and posting pictures of them on social media.

    A             B                      C                          D

I. Write the second sentence so that it has the same meaning to the first one.

36. They are interested in drinking tea after meals.

à They love ………………………………………………………….

37. You are hard-working, and your sister is hard-working, too.

à  Both you and  …………………………………………………………………

II. Write full sentences using the suggested words and phrases given :

38. She / like/ keep/ the bottles/ after/ drink/ the water.

39. Last summer/ we/ join/ community activities/ help / the elderly.

40. When/ I/ be/ a child/ I/ love/ play/ computer games.

II. Fill in the blanks with the word in the box. There is one Extra word you don’t need to use.

benefits / are / when / because / from/ gives

Most of us have a hobby or some, but hobbies differ (28) _______ person to person. Gardening is a relaxing hobby that can be enjoyed by people from any age group. There are various ways by which gardening can offer us relaxation. Gardening (29) _______ us an opportunity to refresh our mind after working or studying time. It brings us the green plants and flowers and fills our lungs with pure oxygen. The outdoor environment and fresh air (30) _______ good for our health. We can get great pleasure from gardening, growing flowers and some vegetables of the season.

Gardening not only offers us the beauty of flowers and plants but also brings us (31) _______. A family with a vegetable garden can save a lot of money when they grow vegetables rather than buy them from ouside. Vegetable gardening is very rewarding (32) _______it makes us feel better, less stressed, and produces delicious vegetables for us to eat.