CO2 - > X -.> Y -> Z -> T -> M -> Z ->V -> C2H4Br2

hoàn thành sơ đồ phản ứng biết Z , T , V là hợp chất hữu cơ đều có 2 nguyên tử cacbon trong phân tử

Five Ways To Improve Your Spoken English At Home

            First, you should improve your English pronunciation because good pronunciation will help people understand your spoken English clearly, even if you don’t know many words. Second, most English learners read too much and listen too little. If you want to improve your English speaking, spend more time listening! Listen to the audio while you read the text, then read the text out loud, trying to imitate the pronunciation you hear in the audio.

            Then, reading English texts out loud will train your mouth and lips to pronounce English words more naturally. I suggest reading every text out loud twice. The first time, read slowly and focus on pronouncing each word correctly. Circle the words that are difficult to pronounce and repeat each one ten times. The second time, read faster and focus on making your English flow, speaking each sentence with a natural rhythm.

            In addition, whenever you learn a new word, try saying it in a complete sentence. If you do this with every new English word you learn, it will help you speak English in complete sentences more naturally.

            Finally, if you don’t have contact with native English speakers, watch TV shows and films in English with English subtitles to learn English conversation patterns.

1. Why should we improve our pronunciation?

.................................................................................................................................................

2. What should we do while listening to English?                

…………………………………………………………………………………………………………..

3. What are the functions of reading the text our loud twice?                      

..............................................................................................

4. What is the best way to learn a new word?                       

…………………………………………………………………………………………………………..

5. Which films should we watch to develop speaking skills?

…………………………………………………………………………………………………………..

A World of Sausage

All over the world, all different cultures created interesting processed meat products, and one of the most popular is undoubtedly sausage.

To begin with, sausage making may be considered disgusting as it deals with using various animal parts. Since meat is ground up, certain cuts and parts of an animal that wouldn’t be served in their original forms can be used. Literally, this means animal parts such as noses, ears, and other less appetizing areas of an animal’s body. Very often, the ground up meat and flesh is mixed with a certain percentage of fat, along with spices and other fillers. After being mixed well, this meat mixture is then stuffed into the cleaned intestines of the animal, which are then sealed at both ends. The result is sausage.

The meats used in sausages come from a variety of animals, although beef and pork are by far the favourites. In some cultures, sausage made from the meat of horses is considered a delicacy. When sausages are cooked, the cooking process sometimes adds to the flavour. While boiling is probably the simplest method, smoking sausages will add a lot of smoky flavour.

Next time, you bite into a sausage, it is probably best not to think too much about how it became the tasty thing you are eating. After all, you don’t want to ruin a good snack

1. Where is the mixture of meat placed?

A. Inside a plastic package                 B. Inside a cleaned intestine

C. Inside a refrigerator                        D. Inside a metal container

2. What won’t be served in their original forms?

A. Certain cuts and parts of animals           B. Spices and fillers

C. Sausages of all types                             D. Intestines of an animal

3. What are by far the favourite meats for making sausages?

A. Chicken       B. Horse meat      C. Cuts of lamb      D. Beef and pork

4. What is the simplest method of cooking sausages?

A. Grilling           B. Smoking           C. Boiling           D. Baking

5. What advice is given in the passage?

A. Be careful when making sausages.

B. Don’t think too much about what you are eating when eating sausages

C. Try not to use too much fat in the meat mixture when making sausages.

D. Make sure intestines are cleaned before packing with meat.

1. I wish you ___________us someday.

      A. visit                 B. will visit                 C. visited                       D. would visit

2. It rains heavily, ___________I can not go to the movie with you.

      A. and                  B. but                         C. because                   D. so

3. The examination will be held ___________July, 2021.

      A. in                   B. on                       C. at                              D. to

4. Disneyland ___________ its 60th birthday on Saturday 18th July, 2015.

      A. celebrated       B. congratulated          C. complicated          D. complimented

5. According to the weather___________, Ho Chi Minh City will be sunny tomorrow.

      A. earthquakes      B. typhoon         C. tornado              D. forecast

6. The man___________is talking with An is my brother.

      A. what              B. whom                 C. which                     D. who

7. Peter__________ come with us tonight, but he isn't quite sure yet.
    A. can                          B. may                      C. will             D. must

8. At 5 o'clock yesterday evening, my elder sister__________ her clothes.
A. ironed               B. is ironing                     C. has ironed               D. was ironing

9. I suggested that Mai__________ the shop on Nguyen Tat Thanh Street.
A. tries                     B. would try                    C. try                  D. tried

10. __________ the Internet is very popular, many older people do not know how to use it.
A. Despite         B. Nevertheless             C. Even though           D. However

11. If people paid more attention to sharing household chores, the family life__________ happier.
A. had been                  B. would have been          C. will be               D. would be

12. It took him years to__________ the shock of his wife dying.
A. go off                  B. get over                C. put off                    D. take on
13. All of my friends have got smart phones. I wish I__________ one too!
A. have                 B. had had               C. have had                 D. had
14. The environmental impact of tourism can be shocking and upsetting, but many governments think it is__________.
A. comprehensive              B. bad                  C. acceptable              D. negative
15. This is very__________ ! Can't you practise your violin somewhere else?
A. conveniently             B. convenient           C. convenience           D. inconvenient
16. Good health and methods of study are very necessary, or__________.
A. available          B. dependable                C. efficient                  D. essential
17. Schools will be more responsive__________ changes in society by constantly tailoring their curriculum and activities.
A. with              B. for                  C. of                            D. to
18. The man__________ design had been chosen stepped to the platform to receive the award.
A. which              B. whom                  C. that                         D. whose
19. Our class__________ into four groups when we have English lessons
A. is usually divided            B. be divided usually    

C. usually divides               D. is dividing usually
20. We have to educate the public about wildlife,__________?
A. don’t we           B. have we                     C. haven't w                D. do we
21. Overpopulation tends to create conditions which may result in of food in__________ developing countries.
A. surpluses         B. supplies              C. shortages                D. failures

22. Two friends are talking to each other at a class reunion.
- Mai: “__________”
Lan: “I work at the bank.”
A. What do you do for a living, Ean?            B. Where did you work, Lan?
C. How do you do, Lan?                               D. How are you doing, Lan?
22. Jack and Peter are talking about time management skill.
- Jack: “What do you think about time management skill?”

- Peter: “__________”
A. I can't help thinking about it.                      B. I quite agree with you.
C. It is an important life skill.                          D. It's time to go

23. Bill has ….his job and gone back to college.

A. let off           B. given up        C. passed up                     D. withdawn

24. I wish to apply …..the post of surveyor with your company.

A. in              B. for                      C. to                D. with

25. I came ….a reference to Makonde carving when I was an artist.

A. across           B. into                         C. over                                    D. for

26. Does anyone know …..this hat might be?

A. who               B. whom           C. whose                      D. to whom

27. The old lady was …..exhausted after the long walk.

A. very              B. absolutely               C. pretty                    D. fairly

28. ..................I get your car, I'll leave.

A. As soon as              B. As though               C. By the time               D. Now that

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 the following question.

29. If you live in an extended family, you'll have great joy and get support of other members
A. nuclear family          B. traditional              C. close family             D. large family

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

30. With price increases on most necessities, many people have to tighten their belt for fear of
getting into financial difficulties
 A. put on tighter belts                           B. save on daily expenses

 C. dress in loose clothes                      D. spend money freely

Mọi ng giúp mình với :<

Cho đường tròn (O;R) và dây BC cố định. Trên tia đối của tia BC lấy điểm A. Kẻ các tiếp tuyến AM, AN với đường tròn (O) (M và N là các tiếp điểm, N thuộc cung BC nhỏ). Gọi H là trung điểm của dây BC. 

1) Chứng minh tứ giác AMON và tứ giác AOHN nội tiếp. 

2) MN cắt AO tại điểm I. Chứng minh rằng AI. AO= AM²

1. - Peter: - “How are you today, Mary?”                   - Mary: - “__________”
       A. Thanks                         B. No, thanks                          C. Fine, thanks            D. Yes, thanks
2. Mr. Brown__________ as a doctor since 2016.
        A. worked                       B. has worked                         C. works                      D. have worked
3. He is the__________ student in die class, base on his high grade.
        A. smartest                      B. smarter                                C. smart                       D. more smart
4. I am the boy__________ is wearing a white T-shirt.
        A. whom                         B. which                                  C. whose                     D. who
5. It all depends__________ my parents. Anyway, we'll keep in touch.
        A. in                                B. at                                        C. of                            D. on
6. He never eats fish, __________?
       A. doesn't he                    B. does he                               C. isn't he                    D. did he
7. The telephone__________ by Alexander Bell.
           A. invented                  B. invent                                 C. was invented          D. is invented
8. If you work hard, you__________ in the final examination.
           A. will succeed            B. succeed                               C. would succeed       D. had succeeded
9. The doctor suggested that his patients__________ smoking.
           A. stopping                  B. to stop                                C. should stop             D. stops
10. - Nam: - “That's an excellent story, Lan”               - Lan: - “__________”
          A. Never mind                                                                          B. It's kind of you to say so
            C. No, thanks                                                                          D. Don't say so
11. I am__________ that people have spoiled this area.
            A. disappointed          B. disappointment                   C. disappointing          D. disappoint
12. Hoa failed her math test.__________, she has to do the test again.
          A. However                  B. Because                              C. Moreover                D. Therefore
13. I wish_______an astronaut on the future

           A. were                     B. to be                     C. would be                   D. will be

14. Let’s wait for them here. I’m sure that they will _____soon.

           A. turn off                 B. turn up                 C. turn down                 D. turn over

15. Mr. and Mrs. Blake were delighted when they _____to sell their house so quickly.

           A. succeeded             B. could                   C. risked                       D. manage

16. The man asked me .....................

            A. where had I gone the previous day.                       B. where I had gone the previous day.

C. where I had gone yesterday.                                  D. where did I go yesterday.

17. Jenny refused to explain the reason ..................... her absence from class last week.

            A. why                                    B. about                      C. for                           D. of

18. The party was great! Everyone enjoyed ..................... very much.

            A. themselves              B. ourselves                 C. oneself                    D. itself

19. Nguyen Du is considered one of the best ..................... that Vietnam has ever produced.

            A. poets                       B. poems                     C. poetry                     D. poetic

21. Please don't put much salt in the soup. Just ......................

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

22. The police are looking for the man ..................... car was found in the jungle last night.

            A. whose                     B. whom                     C. who                        D. his

23. It is high time we.....................something to protect rare animals from extinction.        

A. did                          B. do                           C. will do                    D. are doing

24. Despite working in the same office, Mary earns ..................... her boyfriend.

            A. twice as many as    B. twice more than      C. twice as more than D. twice as much as

25. Jack never helps his mum with the housework,.....................?

            A. does he                   doesn't he                    C. will he                     D. did he

26. When the boy was told that he had failed the exam, he was extremely .....................

            A. disappointing                     B. disappointedly        C. disappointed                       D. disappointment

27. "No, you are not allowed ..................... out tonight, Mike," the father said angrily.

            A. to go                                   B. going                      C. to going                  D. go

28. "The room is too dirty! Do you think it needs...................., honey?" said the wife.

            A. to clean                   B. cleaning                  B. to be cleaning         D. cleaned

29. I think your health will not improve ..................... you give up smoking.

            A. if                             B. when                       C. unless                      D. until

30. Can you close the gate ..................... the hens will not go out?

            A. so as to                   B. in order to               C. in order for             D. so that

Một bóng đèn có ghi 110V – 40W được mắc song song với một biến trở vào hiệu điện thế 110V.

a. Tính điện trở và cường độ dòng điện qua bóng khi bóng sáng bình thường.

b. Khi đèn sáng bình thường thì hiệu điện thế giữa hai đầu biến trở có giá trị bao nhiêu?

c. Tính điện năng mà bóng tiêu thụ trong 1 tháng ( 30 ngày) , mỗi ngày dùng trung bình 4 giờ khi bóng được sử dụng đúng hiệu điện thế định mức.

a. Phát biểu quy tắc nắm tay phải?

b. Vận dụng quy tắc nắm tay phải để xác định theo từng hình:

Hình a,Chiều của đường sức từ trong lòng ống dây và cực của ống dây

Hình b, Chiều của dòng điện chạy qua các vòng dây và cực của nguồn?

Hình c, Cực của ống dây và chiều dòng điện qua các vòng dây?