31. The train ______ half an hour ago. A. has been leavingB. leftC. has leftD. had left 32.The number of competitors who take part in the Olympic Games increases every year. A. participate in B. h...

31. The train ______ half an hour ago. A. has been leavingB. leftC. has leftD. had left 32.The number of competitors who take part in the Olympic Games increases every year. A. participate in B. happen C. take place D. accept 33. Jim_______ to his girlfriend on the phone when I_______ in. A. talked / came B. talked / was coming C. was talking / was coming D. was talking / came 34. Mary is a humorous girl. She always makes me……….. A. laughed B. to laugh C. laughing D. Laugh 35.Christopher Columbus _________ American more than 500 years ago. A. discoveredB. has discovered C. had discovered D. had been discovering 36.If you only care about your interests and feelings, you are very ---------------------. A loyalB friendlyC selfishD happyCâu trả lời: 31. The train ______ half an hour ago. A. has been leavingB. leftC. has leftD. had left 32.The number of competitors who take part in the Olympic Games increases every year. A. participate in B. happen C. take place D. accept 33. Jim_______ to his girlfriend on the phone when I_______ in. A. talked / came B. talked / was coming C. was talking / was coming D. was talking / came 34. Mary is a humorous girl. She always makes me……….. A. laughed B. to laugh C. laughing D. Laugh 35.Christopher Columbus _________ American more than 500 years ago. A. discoveredB. has discovered C. had discovered D. had been discovering 36.If you only care about your interests and feelings, you are very ---------------------. A loyalB friendlyC selfishD happy

37.Each nation has many people who__________ take care of others. A. volunteeredB.voluntarilyC. volunteersD. voluntary 38.Teenagers nowadays often have their own __________ who they really love and imitate in different ways. A. idolB.singerC.personD.crush39. The wedding party _______ held at the Rex Hotel now. A. isB. is beingC. will beD. is going to be 40.The doctor advised _______ late. A. me not staying up B. me not stay up C. me not to stay up D. I did not stay up 41.Where is Mary? – She _________ for the dinner in the kitchen at the present.A. preparesB. preparedC. is preparingD. has prepared 42. Since _______, I have heard nothing from him. A. he had left B. he leftC. he has leftD. he was leftCâu trả lời: 37.Each nation has many people who__________ take care of others. A. volunteeredB.voluntarilyC. volunteersD. voluntary 38.Teenagers nowadays often have their own __________ who they really love and imitate in different ways. A. idolB.singerC.personD.crush39. The wedding party _______ held at the Rex Hotel now. A. isB. is beingC. will beD. is going to be 40.The doctor advised _______ late. A. me not staying up B. me not stay up C. me not to stay up D. I did not stay up 41.Where is Mary? – She _________ for the dinner in the kitchen at the present.A. preparesB. preparedC. is preparingD. has prepared 42. Since _______, I have heard nothing from him. A. he had left B. he leftC. he has leftD. he was left

III. Put the words in the correct Tenses:(1đ) 1.After he (have)…………had had………….breakfast, he went to work yesterday. 2. Don’t waste her time ……………complaining……….(complain) about her salary. 3. My car needs (repair)………………repairing………………. 4.I saw the thief (steal) ……stealing…………………..the bycicle.Câu trả lời: III. Put the words in the correct Tenses:(1đ) 1.After he (have)…………had had………….breakfast, he went to work yesterday. 2. Don’t waste her time ……………complaining……….(complain) about her salary. 3. My car needs (repair)………………repairing………………. 4.I saw the thief (steal) ……stealing…………………..the bycicle.

31. The train ______ half an hour ago. A. has been leavingB. leftC. has leftD. had left 32.The number of competitors...

Hãy tham gia nhóm Học sinh Hoc24OLM

Lun's Be's

22 tháng 4 2020 lúc 22:25

I. VOCABULARY (05 câu) 1. If I had a lot of money now, I a new car. A. would buy B. would sell C. would take D. would make 2. Do you think there would be less conflict in the world if all people the same language? A. listened B. spoke C. read D. wrote 3. A number of cleaning products contain chemicals A. safeful B. helpful C. harmful D. hopeful 4. The gases from the exhausts of cars have also increased pollutio...

Đọc tiếp

I. VOCABULARY (05 câu)

1. If I had a lot of money now, I a new car.

A. would buy B. would sell

C. would take D. would make

2. Do you think there would be less conflict in the world if all people the same language?

A. listened B. spoke C. read D. wrote

3. A number of cleaning products contain chemicals

A. safeful B. helpful C. harmful D. hopeful

4. The gases from the exhausts of cars have also increased pollution in most cities.

A.land B. sand

C. water D. air

5. The death rate would if hygienic conditions were improved.

A. decrease B. increase C. be D. up

II. VERB FORM (05 câu)

1. If I you, I would do that.

A. am B. were C. are D. had been

2. If I were offered the job, I think I it.

A. take B. will take C. would take D. would have taken

3. I would be very surprised if he .

A. refuses B. refused C. had refused D. would refuse

4. If she sold her car, she much money.

A. gets B. would get C. will get D. would have got

5. If someone in here with a gun, I would be very frightened.

A. would walk B. walks C. had walked D. walked

III. WORD FORM (05 câu)

1.People believe that the water has brought cancer to the local residents.

A. pollute B. polluted C.pollution D.polluting

2.Light pollution make us to see the stars in the sky.

A.able` B.able to C.unable D.unable to

3.Noise is considered as pollution.

A.environment B.environmental C.environmentally D.environmentalist

4. habitats have been destroyed in recent years.

A.Nature B.Natured C.Nation D.Natural

5.Water samples collected at these villages were seriously with bacteria. A.contaminated B.contamination C.contaminational D.contaminating

IV. PREPOSITION (05 câu)

1. The course starts 3rd November and ends January.

A. in/on B. on/in C. of/with D. for/of

2. Are you interested learning foreign language?

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

3. I was disappointed the grade I received on my last exam.

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

4. We are looking forward new possibillities.

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

5. The park was named a young hero, Le Van Tam.

A. up B. after C. take off D. take on

22:02

Xem chi tiết

Lớp 11 Tiếng anh Đề kiểm tra học kì 1

bich bich

26 tháng 12 2019 lúc 22:11

Choose the corect answers 1. Instead of buying a new pair of shoes, I had my old ones _____. a. repair b. to repair c. repairing d. repaired 2. Its possible ______ a train across Canada. a. take b. to take c. taking d. to be taken 3. Now that weve finished painting the house, there is nothing left _____. a. to do b. for doing c. to be done d. for being done 4. Before we leave, le...

Đọc tiếp

Choose the corect answers

1. Instead of buying a new pair of shoes, I had my old ones _____.

a. repair b. to repair c. repairing d. repaired

2. It's possible ______ a train across Canada.

a. take b. to take c. taking d. to be taken

3. Now that we've finished painting the house, there is nothing left _____.

a. to do b. for doing c. to be done d. for being done

4. Before we leave, let's have Shelley ______ a map for us so we won't get lost.

a. draw b. to draw c. drawing d. drawn

5. I can hear acat _____ at the window.

a. scratches b. to scratch c. scratching d. was scratching

6. I think your mother should let you ______ your own mind.

a. make up b. to make up c. making up d. made up

7. The police never found the money ______ in thư robbery.

a. stealing b. be stolen c. steal d. stolen

8. Do you know what made so many people ______ their home?

a. evacuate b. to evacuate c. evacuated d. be evacuated

9. _______ bread, you usually need flour, salt, and yeast.

a. Make b. To make c. Making d. For make

10. We saw our favoriteballet _____ at the theater last night.

a. perform b. performing c. performed d. in performing

11. He was never heard ______ 'thank you' in his life.

a. say b. to say c. saying d. said

12. I was delighted ______ my old friends again.

a. to see b. seeing c. seen d. to be seen

13. _______ to friends ís nice but ________ alone is also enjoyable.

a. Talk/to be b. To talk/ be c. Talk/ be d. Talking/ being

14. I'd rather _______ to Elvis than the Beatles.

a. listen b. to lesten c. listening d. listened

15. I can make myself _______ pretty well in English.

a. understand b. to understand c. understanding d. understood

Xem chi tiết

Lớp 11 Tiếng anh Đề kiểm tra học kì 1

Binh Minh

20 tháng 9 2019 lúc 11:09

Giúp em với nhé Wordform Final-year students are...............anxious about getting worm after graduation. NATURE Some regions in the north of our country is very............... MOUNTAIN These students..............spend their spare time at ưeekends taking care of the orphans. VOLUNTEER High school students are among the many..............in the Green Summer Program, whose purpose is to protect the environment. PARTICIPATE Please make yourselves.................while I get dinner ready....

Đọc tiếp

Giúp em với nhé

Wordform

Final-year students are...............anxious about getting worm after graduation. NATURE Some regions in the north of our country is very............... MOUNTAIN These students..............spend their spare time at ưeekends taking care of the orphans. VOLUNTEER High school students are among the many..............in the Green Summer Program, whose purpose is to protect the environment. PARTICIPATE Please make yourselves.................while I get dinner ready. COMFORT The young girl, who died of cancer, had received many letters of support from her fellow.................SUFFER I couldn’t sleep because the bed was so................COMFORT The purpose of this program is to provide education for homeless and.................children. ADVANTAGE Children who are born into poor, large families may be................. EDUCATION This charitable organization relies almost on..................contributions. VOLUNTEER If you’re too trusting, other people will take..............of you. DISADVANTAGED Birds are................enemies of many harmful insects. NATURE Tom, whose parents are.................and barely literate, has a master’s degree from London University. EDUCATE .................is an adventure sport, which may be invilved in dangers. MOUNTAIN When the audience had all sat..................the lecturer began his speech. COMFORT

Xem chi tiết

Lớp 11 Tiếng anh Đề kiểm tra học kì 1

Binh Minh

19 tháng 9 2019 lúc 23:02

Giúp em với nhé Wordform Final-year students are...............anxious about getting worm after graduation. NATURE Some regions in the north of our country is very............... MOUNTAIN These students..............spend their spare time at ưeekends taking care of the orphans. VOLUNTEER High school students are among the many..............in the Green Summer Program, whose purpose is to protect the environment. PARTICIPATE Please make yourselves.................while I get dinner ready....

Đọc tiếp

Giúp em với nhé

Wordform

Final-year students are...............anxious about getting worm after graduation. NATURE Some regions in the north of our country is very............... MOUNTAIN These students..............spend their spare time at ưeekends taking care of the orphans. VOLUNTEER High school students are among the many..............in the Green Summer Program, whose purpose is to protect the environment. PARTICIPATE Please make yourselves.................while I get dinner ready. COMFORT The young girl, who died of cancer, had received many letters of support from her fellow.................SUFFER I couldn’t sleep because the bed was so................COMFORT The purpose of this program is to provide education for homeless and.................children. ADVANTAGE Children who are born into poor, large families may be................. EDUCATION This charitable organization relies almost on..................contributions. VOLUNTEER If you’re too trusting, other people will take..............of you. DISADVANTAGED Birds are................enemies of many harmful insects. NATURE Tom, whose parents are.................and barely literate, has a master’s degree from London University. EDUCATE .................is an adventure sport, which may be invilved in dangers. MOUNTAIN When the audience had all sat..................the lecturer began his speech. COMFORT

Xem chi tiết

Lớp 11 Tiếng anh Đề kiểm tra học kì 1

Tịnh y

11 tháng 12 2021 lúc 21:56

8. If he knows (A) how to (B) use a (C) computer, he could find a good (D) job.

9. If you forgot (A) to take (B) the (C) keys, you will not get into (D) the house.

10. If it was not raining (A), we can (B) have lunch in (C) the (D) garden.

Xem chi tiết

Lớp 11 Tiếng anh Đề kiểm tra học kì 1

Dương mỹ như

3 tháng 10 2018 lúc 16:24

Choose the best answer A, B, C, D to complete the gaps

Dear Jane,

I'm sorry for not 1. To you for two mouths. In my postcard sent to you when I was on vacation in July, I told you. 2. A new friend of mine , Lisa Moran, who lives near my uncle's farm in Napa Valley, California. You may be curious to know what she is like.

1A write. B to write. C writing. D wrote.

2 A to. B in. C of. D about

Xem chi tiết

Lớp 11 Tiếng anh Đề kiểm tra học kì 1

Phương Quỳnh

12 tháng 12 2019 lúc 20:18

Last Sunday was definitely not a good day for me. It all started when I got into my car and it refused to start. I immediately realised that I had left the lights on and the battery had gone flat. I telephoned my friend George and he came round and helped me start the car. I then drove into town to see a friend. I had arranged to meet him at six thirty, but by the time I got there, it was ten past seven and my friend was not there. I waited for him for an hour despite the freezing weather, but h...

Đọc tiếp

Last Sunday was definitely not a good day for me. It all started when I got into my car and it refused to start. I immediately realised that I had left the lights on and the battery had gone flat. I telephoned my friend George and he came round and helped me start the car. I then drove into town to see a friend. I had arranged to meet him at six thirty, but by the time I got there, it was ten past seven and my friend was not there. I waited for him for an hour despite the freezing weather, but he didn’t come. When I returned to my car, I saw that someone had broken into it, probably looking for the radio. Luckily , I never leave the radio in the car ! There was nothing I could do but get into my car and drive home. Later I spoke with my friend and discovered that he had waited for only half an hour and left. He didn’t even apologise for not waiting for me longer.

1.How did the writer's unlucky day start?

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

2. Who helper her start the car?

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

3. How long was she be late for seeing her friend in town?

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

4. Did her friend wait for her? How long had he waited?

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

Xem chi tiết

Lớp 11 Tiếng anh Đề kiểm tra học kì 1

trang hoan

5 tháng 12 2019 lúc 21:53

Im in favor of English-speaking contests in schools. Such contests(1) _______ students to practice speaking English in their classes and help them improve their speaking skills. Besides, while(2)_____ themselves for the contests, students have a chance to review their lessons thoroughly. Contests among classes provide students with opportunities to wprk with team spirit, thus eabling them to learn how(3)_____ with other people. Some students may think that their preparations for the speaking con...

Đọc tiếp

I'm in favor of English-speaking contests in schools. Such contests(1) _______ students to practice speaking English in their classes and help them improve their speaking skills. Besides, while(2)_____ themselves for the contests, students have a chance to review their lessons thoroughly. Contests among classes provide students with opportunities to wprk with team spirit, thus eabling them to learn how(3)_____ with other people. Some students may think that their preparations for the speaking contests are time-consuming. However, in my opinion, such preparations are worth spending time on. My classmates and I have found that we speak English better after each contest. In sum, English-speaking contest(4) _______ school are usful to students.

1. A. advise B. suggest C. invite D. encourage

2. A. to prepare B. preparing C. prepare D. was preparing

3. A. to exchange B. to speak C. to cooperarate D. to compete

4. A. at B. on C. about D. to

Xem chi tiết

Lớp 11 Tiếng anh Đề kiểm tra học kì 1

Bùi hiếu

4 tháng 1 2022 lúc 19:58

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions. Question 1: A. voluntaryB. library C. denyD. physical Question 2: A. laughedB. lovedC. walkedD. finished 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. Question 3: A. volunteerB. physica...

Đọc tiếp

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions. Question 1: A. voluntaryB. library C. denyD. physical Question 2: A. laughedB. lovedC. walkedD. finished 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. Question 3: A. volunteerB. physical C. medicalD. cognitive Question 4: A. obeyB. viewpointC. footstepD. childcare 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 each of the following questions. Question 5: When I’m in trouble, my close friends are always willing to lend an ear and give me some advice. A. share the financial burdens B. speak frankly C. be beside and support D. listen to with sympathy Question 6: ASEAN stands for the Association of Southeast Asian Nations. A. is on behalf of B. originates from C. is the short way of saying D. is the symbol of 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. Question 7: Viet Nam and Laos will closely cooperate to strengthen the solidarity of ASEAN and enhance the vital role of the group in regional security structure. A. agreement B. separation C. cooperation D. fellowship Question 8: We greatly respect my teacher for all of the best things that she brought to us. A. look up to B. look forwards C. look for D. look down on Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Question 9: One advantage of living in a/an ______ is to strengthen relationship between young children and adults. A. nuclear family B. nuclear house C. extended houseD. extended family Question 10: I make a determination ___________ the best result in the coming exam. A. get B. got C. gettingD. to get Question 11: He never says anything that is worth __________ to. A. listening B. listenC. to listen D. to listening Question 12: With a population of over 237 million people, Indonesia is the world’s fourth most _________country. A. populated B. populationC. populous D. overpopulation Question 13: Overpopulation is one of the main factors that leads to ____________, illiteracy, and social evils. A. wealthy B. poor C. povertyD. rich Question 14: The ASEAN Charter came ___________ force on 15 December 2008. A. up with B. into C. out of D. up Question 15: He suffered ___________ serious depression after losing his beloved pet. A. in B. for C. with D. from Question 16: During the examination, students __________ keep silent and focus on their own papers. A. need B. must C. can D. have to Question 17: Her brother ________ for this voluntary organization for two years since he ______ from university. A. worked/ graduated B. has worked/ graduated C. worked/ has graduated D. has worked/ has graduated Question 18: They promised ___________ me ___________ for the party. A. to help/ preparing B. helping / preparing C. to help/ prepare D. helping/ to prepare Question 19: Vietnam U23 Football team had a ___ victory over Qatar in the semi-final of the AFC U23 championship. A. history B. historianC. historic D. historically Question 20: The Braille alphabet has been one of the greatest __________ in human history. A. inventions B. invention C. inventors D. inventive Question 21: He advised me ________ the facts and I decided ________ the job. A. considering / to accept B. consider / accepting C. consider / accept D. to consider / to accept Question 22: _____ believe that some of the happiest people in the world are those who help bring happiness to others. A. Voluntary. B. Voluntarily. C. Volunteers D. Volunteer Question 23: John hasn’t heard anything about his ex-girlfriend since they broke ________. A. out B. off C. into D. up Question 24: My grandpa is the most conservative person in my family. He never ______ about way of life. A. gives his opinionB. changes his mind C. gives his view D. keeps in mind Question 25: __________ you should really speak to when you have problems. A. It’s your parents whose B. It’s your parents that C. It’s your parents what D. It’s your parents when Question 26: By __________day and night he succeeded in __________ the job in time. A. work / finish B. working / finishingC. to work / to finishD. worked / finished Question 27: She did a funny little curtsy which Josh and Silver couldn’t help __________ at. A. laugh B. to laughing C. to laugh D. laughing Question 28: You_____ tell anyone what I’ve revealed to you. It’s still a secret. A. mustn’t B. had better not C. ought not toD. don’t have to Mark the letter A, B, C, or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges. Question 29: “As far as I know, doing charity work is a really helpful thing for everyone in the society." – “____” A. That sounds great.B. I couldn't agree with you more. C. I'll take part in this campaign. D. That's fine for me. Question 30: "____ going on a picnic this weekend?" - "That's great!" A. How about B. Would you likeC. Why don't we D. Let's 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 31 to 35 THANKS A MILLION Percy Ross was born in 1916 in Michigan. His parents have come to the USA from Latvia and Russia and the family were poor. But Percy soon showed a talent (31) ____ business and made a fortune in the fur trade and auction business. Then disaster struck and he (32) ____ all his money. But he soon made a fortune again - this time by (33) ____ plastic bags. In 1969, he sold his plastic bag company for millions of dollars. Ross started giving away in 1977: he gave $50,000 to 50 Vietnamese refugees so that they could make a new home in the USA. (34) ____ he held a Christmas party for 1,050 poor children in the American town of Minneapolis. Ross bought a bike for every one of the 1,050 children at the party. After these first experiences of giving money away, Ross decided to do it on a regular basis. He started a newspaper column called ‘Thanks a Million’. and later a radio show, in order to give away his money. It took years, but Ross finally (35) ____ in giving away his entire fortune. Question 31: A. forB. withC. onD. of Question 32: A. threwB. wastedC. lostD. sent Question 33: A. manufactureB. manufacturedC. manufacturer D. manufacturing Question 34: A. ButB. YetC. ThenD. Though Question 35: A. triedB. succeededC. interested D. invested Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 40 This is part of a report by the Chairman of the Charities Committee of a Club. By Match this year, we shall have raised enough money, we hope, to buy the equipment for the Youth Club. When we have raised the money, we are planning to go back to the Youth Club leaders in order to discover exactly what is needed most. Plans have been made for the Book Sale which will be held on 15th February, this means that many of us will be spending the first two weeks of February collecting books. The event is likely to be held in the Town Hall. If there are problems here, however, we hope that other Club members might come up with some alternative suggestions. As we are proposing to sponsor a student from Africa on a three-month language course in this country, we also intend to hold a Charity Dance in the spring. Such events are apt to be difficult to organize, so all members of the Club are invited to contribute or help in any way they can. The moment I was asked if we could possibly help in some way with the new Club for the Disabled. I said yes. As Chairman, l am bound to say that this is the sort of social work many Club members would like to do, other than simply raising money. We are therefore planning to ask members if they can perhaps help out on one Saturday every month. Finally, by January next year the Club will have been going for twenty years, and the Committee intend to mark this anniversary with some kind of dinner, a dance or a party. We have already been offered (unofficially) the use of the dance hall at 'The Forest Hotel'. However, we shall be devoting one of our meetings in the near future to full discussion on the form of the event, etc. Any suggestions will be welcome. Question 36: The Committee does not yet know ______. A. how to get the books to the Town Hall B. when books will be collected C. where the Book Sale will take place D. when the Book Sale will be held Question 37: Every Club member has been asked ______. A. to write to an African student B. to help with the Charity Dance C. to organize something for the Dance D. to sponsor a foreign student Question 38: The Committee will be going back to the Youth Club leaders ______. A. to tell them about the equipment B. to collect old books from them C. to ask for money in March D. to find out what the Club needs Question 39: There will be an event next January ______. A. to raise money for a student from Africa B. which will take the form of a discussion evening C. because the Club has been offered 'the Forest Hotel’ D. to celebrate the Club's twentieth birthday Question 40: In order to help the new Club for Disabled, members will be asked ______. A. if they can plan a Club program B. to help at the Club once a month C. to raise some money D. to make a contribution Mark the letter A, B, C, or D on your answer sheet to indicate the mistake in each of the following questions and correct it Question 41: I will leave the party early because I must studying for my exam. A BC D __________________________________________________________________________________ Question 42: ASEAN was found in Bangkok, Thailand on 8 August 1967 when the five founding A B C members signed the ASEAN Declaration. D __________________________________________________________________________________ Question 43: After an hour of discussion, all the members of the committee felt happily about the decision. A B C D __________________________________________________________________________________ Complete these sentences, using the correct form of the words in brackets. Question 44: Several talented students have been awarded the Singapore ____________ and will have a chance to study at universities in Singapore. (scholar) Question 45: During summer holidays, university students are willing to take part in providing education for children in remote and ____ areas. (mountain) Rewrite the following sentences without changing its original meaning using the word given (the given word cannot be altered) or beginning with the words given: Question 46: She started working as a secretary 5 years ago. She has ______________________________________________________________________________ Question 47: Tom spent 3 hours trying to repair the old bike. Tom wasted_________________________________________________________________________ Question 48: My father said I could use his car. My father allowed______________________________________________________________________ Question 49: My students’ bad behavior made me sad yesterday morning. (using cleft sentence) It ___________________________________________________________________________________ Question 50: I advised you to learn a foreign language before applying for a job. You had better ________________________________________________________________________

Xem chi tiết

Lớp 11 Tiếng anh Đề kiểm tra học kì 1

Đề kiểm tra học kì 1

Khoá học trên OLM (olm.vn)

Khoá học trên OLM (olm.vn)

Đề kiểm tra học kì 1

Câu hỏi

Khoá học trên OLM (olm.vn)

Khoá học trên OLM (olm.vn)