Hiđrocacbon X có công thức phân tử C 5 H 8 . Khi cho X tác dụng với dung dịch A g N O 3 trong N H 3 , sinh ra kết tủa màu vàng nhạt. Số công thức cấu tạo thỏa mãn điều kiện trên của X là

A. 1.

B. 3.

C. 2.

D. 4.

Mark the letter A, B, C or D on your answer sheet to indicate the word that differ from the rest in the position of the main stress in each of the following questions

A. available 

B. absolutely 

C. certificate 

D. appropriate

Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

I have never played golf before.

A. This is the first time I have played golf.

B. I used to play golf but I gave it up already

C. It’s the last time I played golf.

D. It is the first time I had played golf.

Hai xe A và B cùng đặt trên mặt phẳng nằm ngang, đầu xe A có gắn mộ lò xo nhẹ. Đặt hai xe sát nhau để lò xo bị nén rồi buông nhẹ để hai xe chuyển động ngược chiều nhau. Tính từ lúc thả tay, xe A và B đi được quãng đường lần lượt là 1 m và 2 m trong cùng một khoảng thời gian. Biết lực cản của môi trường tỉ lệ với khối lượng của xe. Tỉ số khối lượng của xe A và xe B là

A. 2.

B. 0,5.

C. 4.

D. 0,25.

dễ

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions

A. considerate

B. continental 

C. territorial 

D. economic

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.

School uniform is compulsory in most of Vietnamese school.

A. depended 

B. optional 

C. obligatory 

D. required

Cho m gam Mg vào dung dịch X gồm 0,03 mol Zn NO 3 2 và 0,05 mol Cu NO 3 2 , sau một thời gian thu được 5,25 gam kim loại và dung dịch Y. Cho dung dịch NaOH vào Y, khối lượng kết tủa lớn nhất thu được là 6,67 gam. Giá trị của m là

A. 2,86

B. 4,05

C. 3,60

D. 2,02

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the best option for each of the blanks. Fill in the appropriate word in question 53

      I was raised on a farm in a remote village in the 1950s. The winter months were endless and everything was covered in snow. I was always (53)________ for the warmer weather to come. When spring arrived, everything came alive- flowers would bloom and the animals would come out of hibernation. I would follow the bear tracks and search for them. Once, however, I (54) ________ an angry mother bear who saw me (55) ________ a threat. (56) ________ the sight of the bear, I did what my father had told me. I stood still until she stopped growling and walked away. The trick was effective, but looking back now, I realized that the situation was (57) ________ more serious than I thought at the time. By the age of twelve, I had lots of camping (58) ________, as I used to go camping with my dog on my school holidays. We would spend days (59) ________ the forest, catching fish for dinner, (60) ________ at the frogs and the (61) ________ of birds and the insects hopping up and down on the surface of the water. Of course, this was possible only during the warm months. When the autumn came, everything went quiet, which was quite usual in those parts. It wasn’t long before the animals disappeared, the birds (62) ________ south and the snow took over. The place became deserted once again.

A. found out

B. came across

C. dealt with

D. reached

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 55 to 64. Fill in the appropriate word in question 63

The UK Government ensures that all schools in the UK(55)_______ certain standards, and this includes independent schools as well as those that are  (56)_______ by the Government. All qualifications are awarded by national agencies accredited by the Qualification and Curriculum Authority (QCA), (57)_______ the quality of the qualifications you will gain is guaranteed.

At many independent schools inEngland, you will be encouraged to take part (58)_______ extracurricular activities to develop your hobbies and learn new skills, and you may be encouraged to take graded music exams (59)_______ by the Associated Board of the Royal Schools of Music. The exam grades gained from these are widely accepted toward university entry  (60)_______ .

Independent schools do not usually offer vocationally focused qualifications but if you are (61)_______ in these qualifications, you can find out more in the 'career-based and pre-university qualifications' section.

`      The (62)_______ you pay to attend independent school, include your course fees, accommodation and may include some or all extracurricular activities. Fees (63)_______ from school to school and are at the discretion of the institution; there are no national standards. You should expect to pay a minimum of £8,000 per year and fees can be (64)_______ high as £25,000.

A. vary 

B. exchange

C.  transfer 

D. interfere