điền từ trong ngoặc vào chỗ trống:1.this time in 2030, many countries...............nuclear power (are using / are going to use / will be using / will use)2.I..........stay up late watching TV last ye...

2

TT

Trần Tôn Minh Kỳ

7 tháng 5 2019

1. are painting
2. C.will be using
3. B.used to
4. A.careless

*Note: 1 là (paint)(vẽ), ko phải (pain)(đau)
4 là cả A lẫn B đều là careless (mặc dù câu B có 2 dấu chấm)

BB

Bangtan Bàngtán Bất Bìnhtĩnh

7 tháng 5 2019

à câu B là carelessly

I.Choose the correct word or phrase in each sentence. 1. This time next year my father (will work/ will be working) in the hydro power station. A.will work B.will be working 2. Jane won’t be here this time tomorrow. She (will attend/ will be attending) the Conference on Green Energy. A.will attend B.will be attending 3. My brother and I (will cycle/ will be cycled) to school to cut air pollution. Awill cycle ...

TB

Trường Beenlee

19 tháng 4 2020

I. Find the word which has different sound in the part underlined. 1. A. brainstorm B. sailing C. railway D. captain 2. A. plane B. safety C. traffic D. station 3. A. vehicle B. mention C. enter D. helicopter 4. A. happy B. house C. here D. hour 5. A. maps B. papers C. cats D. books 6. A. started B. decided C. worked D. waited 7. A. played B. closed C. filled D. needed 8. A. frightened B. amazed C. disappointed D. terrified 9. A. thread B. beam C. breath D. stead 10. A. naked B. booked C....

0

LP

Lưu Phương Anh

24 tháng 3 2020

I. Find the word which has different sound in the part underlined. 1. A. brainstorm B. sailing C. railway D. captain 2. A. plane B. safety C. traffic D. station 3. A. vehicle B. mention C. enter D. helicopter 4. A. happy B. house C. here D. hour 5. A. maps B. papers C. cats D. books 6. A. started B. decided C. worked D. waited 7. A. played B. closed C. filled D. needed 8. A. frightened B. amazed C. disappointed D. terrified 9. A. thread B. beam C. breath D. stead 10. A. naked B. booked C. worked D. walked II.Choose the correct answer to complete each following sentence by circling A, B, C or D. 1. Linda used to ________ morning exercise when she got up early. A. did B. does C. doing D. do 2. My mum __________the bus to work every day, but I cycle. A. catches B. drives C. goes D. runs 3. You should look right and left when you go ________the road. A. down B. across C. up D. along 4. Bus is the main public ________in Viet Nam. A.travel B. tricycle C. transport D. vehicle 5. The play was so boring. ________, An saw it from beginning to end. A. Therefore B. Despite C. However D. Although 6. She’s sure that they will find the film_________. A. entertaining B. entertain C. entertainment D. entertained 7. – “ Do you like seeing a film?” – “_________________” A. No, I don’t like it at all B. Sure. What film shall we see? C. Who is in it? D. I’m sorry, I can’t. 8. ____________ being frightened by the images, Lan still liked the film so much. A. In spite B. Despite C. Although D. Nevertheless 9. ____________ is La Tomatina celebrated? – Every August. A. Where B. Why C. When D. Which 10. My father liked the ____________ of that singer. A. perform B. performer C. performance D. performing 11. Does your bike ever ________ down on the way to school. A. break B. take C. do D. turn 12. I __________go on foot when I was in primary school. A. used to B. break C. can D. may 13. Give a________ before you turn left or right. A. signal B. turn C. sound D. sign 14.In the party last night, she looked in a red dress. A. love B. lovely C. loving D. lovelily 15. Is Minh with the final semester‘s result? B. Satisfy B. satisfied C. satisfying D. be satisfying 16. The ending of the film is All audiences are very sad. A.disappointed B. satisfying C. disappointing D. satisfied 17. This is a film and it makes me cry a lot. A.funny B. moving C. comedy D. excited 18. he is a CEO and earns a lot of money, he is very mean. A. Because B. Although C. Despite D. Because of 19.This is a(n) on real life during wars in Vietnam in 1945. A. horror film B. sci-fi C. comedy D. documentary 20.He the Oscar Prize as the best actress this year. A. wins B. acts C. performs D. directs 21. She is hard working , she isn‘t lucky in examinations. A.Therefore B. But C. However D. So 22. She decided to quit this job the low salary. A.because of B. despite C. because D. although 23. Minh used to jigsaw puzzles in his spare time. A. do B. does C. doing D. did 24. Public in this city is quite good, and it‘s not expensive. A. vehicle B. travel C. transport D. journey 25. It‘s about 2 kilometers ………………my house school. A. between/and B. from/to C. between/to D. from/ and III. Put the correct form of the verb in brackets. 1.Nam often ( play) ________________________ soccer in the afternoon. 2.My father used to (go) _____________________swimming when he was a child. 3.What about ( go) ____________________ to the zoo on Sunday evening ? 4. Tien Dung goalkeeper ( live ) _____________________ Thanh Hoa city since 1997. 5.I used to ( go) ____________________ to the zoo on Sundays when I was a child. 6.Xuan Truong footballer ( play) ________________________ soccer beautifully last Saturday. 7.Nam used to (go) _____________________fishing when he was a child. 8.They (learn ) _____________________ English for five years. 9.How about ( go) ____________________ to the zoo on Sunday evening ? 10.Quang Hai footballer ( play) ________________________ soccer beautifully last Saturday. 11.I ( meet ) ______________________ her at the movie theater last night. 12.He ( go ) ___ to the English club every Sunday. But last Sunday he ( not go ) ________ there, he went to the City’s museum. 13.Two years ago, she ( teach ) ______________________ at a village school. 14.What __________you (do) ____________ yesterday morning? 15.We ( travel ) ______________________ to Hue next month. 16.My mother ( not like ) ______________________ riding a motorbike. 17.When my father was young, he (drink ) _____________________ a lot of beer. 18.Nam ( study ) ______________________ homework in the living room now. 19.Be careful ! The car ( come ) ______________________ . 20.My mother ( go ) ______________________ to the supermarket yesterday evening. IV. Find and correct a mistake in each sentence 1. Use roads careful so we may be able to use them for a long time. 2. I saw some cars stop by the police. 3. The car was too expensive for him buying. 4. My father is a careful driver and he doesn’t drive too fast or dangerous. 5. On the way we passed, there were many interested sights. 6. The old house in the end of the road has been sold. 7. Despite of taking a taxi, he arrived late. 8. The gate are closed so that the children can’t run into the road. 9. The train had just left when I arrive at the station. V: Make one sentence from two. Use the word(s) in brackets in your sentences. 1. I couldn't sleep. I was very tired. Despite I couldn't sleep despite being vey tired. 2. They have very little money. They are happy. In spite of ....................................................................................................................................... 3. My foot was injured. I managed to walk to the nearest village. Although ........................................................................................................................................ 4. I enjoyed the film. The story was silly. In spite of ....................................................................................................................................... 5. We live in the same street. We hardly ever see each other. Despite .......................................................................................................................................... 6. I got very wet in the rain. I was only out for five minutes. Even though .................................................................................................................................. VI. Rewrite sentences with In spite of / Despite /because / because of 1. Although Tom was a poor student, he studied very well. In spite of _______________________________________________________________ 2. Mary could not go to school because she was sick. Because of _______________________________________________________________ 3. Although the weather was bad, she went to school on time. Despite _______________________________________________________________ 4. Because there was a big storm, I stayed at home. Because of _______________________________________________________________ 5. In spite of his good salary, Tom gave up his job. Although_______________________________________________________________ 6. He is so young. His acting is excellent. Although___________________________________________________________________ 7. The film poster is fascinating. I don't want to see this film. In spite of___________________________________________________________________ 8. Although our plan is careful, we made some mistakes. Despite______________________________________________________________ VII. Read the following passage and choose the best answer Making a film takes a long time and is very hard work. Writing the story for the film may take many weeks. Filming the story, or shooting the film, often takes at least six months. Actors and cameramen work from very early in the morning until late at night. Each scene has to be acted and re-acted, filmed and re-filmed, until it is just fine. Sometimes the same scene has to be acted many times. The film studio is like a large factory, and the indoor stages are very big indeed. Scenery of all kinds is made in the studio. Churches, houses, and forests are all built of wood and cardboard. Several hundred people work together to make one film. Some of these people are the actors and actresses. The director of the film, however, is the most important person in a film studio. He decides how the scenes should be filmed and how the actors should act. Most people go to see a film because they know the film stars are in it. Sometimes the film may be very poor. It is best to choose a film made by a good director. Some famous directors make their films very real; people feel that they themselves are among the people in the films. 1. Shooting a film often takes…………………. A. less than six months B. at least six months C. many weeks D. from early in the morning until late night 2. Some scenes have to be filmed many times because……………. A. it takes a long time to make a film B. it is often difficult to make them just right C. many people work together D. the film is poor 3. Which of the following is compared to a factory? A. The film studio B. The indoor stage C. The scenery D. A poor film 4. The director of a film………………… A. is always an actor B. makes the scenery C. is a film star D. says how each scene should be filmed 5. We should choose a film which…………………. A. has actors we know B. seems very real C. takes a long time to make D. is made by a good director 6. Which of the following statements is NOT true? A. Writing the story for the film is a part of making a film. B. The indoor stages in the film studio are very big. C. All of the people in film making are actors and actresses. D. Shooting the film often takes many months. 7. The best title for the passage is "________ ". A. Writing the Story B. Actors and Actresses C. A Director D. Making a Film

Use the correct form of the words in brackets : 1. We used to ( cycle ) ...................... to school two years ago. Now we walk 2. Nuclear power ( replace ) ........................ in the future 3. In spite of ( be ) ....................... ill, he goes to school today 4. At this time tomorrow, my classmate ( show ) ...................... a film on types of renewable energy sources 5. We liked the ( perform ) ....................... of that young pianist 6. Christmas is a popular...

0

JJ

Jeon Jungkook Bangtan

25 tháng 4 2017

9. There ……. a stadium in the town but now there isn’t.A. use to be B. was used to C. is used to D. used to be10. She didn’t use to…… in the fatory.A. work B. woking C. to work D. worked11. Did you ……… to the cinema when you lived in London?A. used to go B. were used to go C. use to go D. were used to going12. I ……… stay up late watching TV last year but now I don’t.A. be used to B. used to C. get used to D. be used forII. Find mistake in sentence and correct...

2

S

_silverlining

CTVVIP

25 tháng 4 2017

Use the correct form of the words in brackets :

1. We used to ( cycle ) ...........CYCLE........... to school two years ago. Now we walk

2. Nuclear power ( replace ) .............WILL REPLACE........... in the future

3. In spite of ( be ) ............BEING........... ill, he goes to school today

4. At this time tomorrow, my classmate ( show ) ...........WILL BE SHOWING........... a film on types of renewable energy sources

5. We liked the ( perform ) ...........PERFORMANCE............ of that young pianist

6. Christmas is a popular ( festival ) .............FESTIVAL............ in many countries and people ( celebration ) .......CELEBRATE................ it in different ways

7. I have been a lot of ( parade ) ................PARADE........ in my life

8. My father drives his motorbike ( care ) ..............CAREFULLY.......... so he never has accident

9. What I like about festivals is that they show the ( culture ) .........CULTURAL............... values of different communities

10. ( I ) .............MY.......... books are here on the table. Where are ( you ) ..............YOURS........... ?

11. The end of the film was so ( move ) .......................MOVING.....

12. That was an ( interest ) .........INTERESTING............... book and I was

13. Solar energy is renewable, .............PLENTIFUL............ and clean PLENTY

14. We should reduce the use of ...............ELECTRICITY............ at home ELECTRIC

15. Solar power can be used to ..................HEAT...... or cool our houses HOT

Đúng(3)

LD

Linh Diệu

26 tháng 4 2017

Use the correct form of the words in brackets :

1. We used to ( cycle ) ..........cycle............ to school two years ago. Now we walk

2. Nuclear power ( replace ) .........will be replaced............... in the future

3. In spite of ( be ) ...........being............ ill, he goes to school today

4. At this time tomorrow, my classmate ( show ) .......will be showing............... a film on types of renewable energy sources

5. We liked the ( perform ) ............performance........... of that young pianist

6. Christmas is a popular ( festival ) ........festival................. in many countries and people ( celebration ) ...........celebrate............ it in different ways

7. I have been to a lot of ( parade ) .........parades............... in my life

8. My father drives his motorbike ( care ) .......carefully................. so he never has accident

9. What I like about festivals is that they show the ( culture ) ...........cultural............. values of different communities

10. ( I ) ...........my............ books are here on the table. Where are ( you ) .........yours................ ?

11. The end of the film was so ( move ) ..........moving..................

12. That was an ( interest ) .........interesting............... book and I was

13. Solar energy is renewable, .........plentiful................ and clean PLENTY

14. We should reduce the use of ...............electricity............ at home ELECTRIC

15. Solar power can be used to ............heat............ or cool our houses HOT

Đúng(2)

NT

Nguyễn Thị Quỳnh Anh

25 tháng 3 2020

1

A

𝑳â𝒎 𝑵𝒉𝒊

25 tháng 3 2020

9. There ……. a stadium in the town but now there isn’t.

A. use to be B. was used to C. is used to D. used to be

10. She didn’t use to…… in the fatory.

A. work B. woking C. to work D. worked

11. Did you ……… to the cinema when you lived in London?

A. used to go B. were used to go C. use to go D. were used to going

12. I ……… stay up late watching TV last year but now I don’t.

A. be used to B. used to C. get used to D. be used for

I.Choose the correct word or phrase in each sentence. 1. This time next year my father (will work/ will be working) in the hydro power station. A.will work B.will be working 2. Jane won’t be here this time tomorrow. She (will attend/ will be attending) the Conference on Green Energy. A.will attend B.will be attending 3. My brother and I (will cycle/ will be cycled) to school to cut air pollution. A.will cycle B.will be cycled 4. By the year 2020, people in my village (will use/ will be...

TB

Trường Beenlee

19 tháng 4 2020

1

K

Komorebi

19 tháng 4 2020

I.Choose the correct word or phrase in each sentence.
1. This time next year my father (will work/ will be working) in the hydro power station.
A.will work B.will be working
2. Jane won’t be here this time tomorrow. She (will attend/ will be attending) the Conference on Green Energy.
A.will attend B.will be attending
3. My brother and I (will cycle/ will be cycled) to school to cut air pollution.
A.will cycle B.will be cycled
4. By the year 2020, people in my village (will use/ will be using) energy from the sun.
A.will use B.will be using
5. What (will we do/ will we be doing) to save electricity?
A.will we do B.will we be doing
6. What (will happen/ will be happened) to us when the non-renewable energy sources run out?
A.will happen B. will be happened
7. Wind power is a renewable source because it (can be replaced/ can replace) easily and quickly.
A.can be replaced B.can replace
8. The students in my school (will be put/ will be putting) low energy light bulbs in the school.
A.will be put B.will be putting
9. Alternative sources of energy (will be developed/ will develop) quickly.
A.will be developed B.will develop
10.The energy consumption (will be reduced/ will reduce) as much as possible.
A.will be reduced B.will reduce

Đúng(1)

TB

Trường Beenlee

19 tháng 4 2020

E cảm ơn nhiều ạ 😍😘

I. Choose the correct answer to completeeach following sentence by circling A, B, C or D: 1. We _________ solar panels in the schoolyard while you are checking cracks in the water pipes. A. Have put B. will be putting C. will put D. put 2. At 7.00 tomorrow, you __________ to school. A. Cycle B. will cycle C. will be cycling D. will be cycled 3. Solar energy __________ by many countries in the world in the future. A. Use B. will use C. will be using D. will be used 4. At this time...

HH

HATHACO HATHACO

21 tháng 6 2020

Choose the correct option for each gap in the sentences : 1.Linh used to .................... jigsaw puzzles in his free time ( do / does / doing / did ) 2. My mum ....................... the bus to work every morning, but David drivers ( catches / goes / does / runs ) 3. Traffic accidents can be prevented if people ......................... the rules ( remember / obey / go after / take care of ) 4. You should look right and left when you go ....................... the road ( along / up /...

0

JJ

Jeon Jungkook Bangtan

21 tháng 4 2017

Choose the correct option for each gap in the sentences :

1.Linh used to .................... jigsaw puzzles in his free time ( do / does / doing / did )

2. My mum ....................... the bus to work every morning, but David drivers ( catches / goes / does / runs )

3. Traffic accidents can be prevented if people ......................... the rules ( remember / obey / go after / take care of )

4. You should look right and left when you go ....................... the road ( along / up / down / across )

5. Hurry up, or we'll ....................... the last bus ( lose / avoid / miss / drop )

6. Before the new system of traffic control, there ..................... be more accidents ( use to / used to / is used to / get used to )

7. Public ........................ in this city is quite good,and it's not expensive ( journey / travel / vehicle / transport )

8. ........................ isn't very far from here to the harbour ( there / this / it / that )

9. Did you read that ..................... of the Chainsaw Massacre at Halloween ? It said that the films was so gripping ( review / report / summary )

10. Vanilla Sky ...................... Tom Cruise, Pénelope Cruz and cameron Diaz ( acts / plays / stars )

11. I like the film very much ! The characters are unforgettable and the ..................... is gripping ( plot / style/ acting)

12. The film was so boring ......................., Jack saw it from the beginning to the end ( Therefore / However / Although )

13. In spite of having a happy ......................., the film begins with a terrible disaster ( ending / acting / setting )

14. I'm sure you will find the film ....................... ( amuse / amused / amusing )

15. Avatar is a 3D hit- the special ........................ are amazing ( effects / scenes / staegs )

16 " Do you feel like seeing a film ? " - ........................ ( No, I don't like it all / Sure what film shall we see / Who is in it ? )

17. If you want to know which films are on at the cinemas, you should look at the film ...................... this newspaper ( section / review / report )

18. It stars Marlon Brandon as the Godfather. He won an Oscar for his ......................... as the boss ( action / performance / direction )

19. Does your bike ever ........................ down on the way to school ? ( break / take / do / turn )

20. I ........................ go on foot when I was in primary school ( have to / can / may /used to )

21. Give a ........................ before turnm left on right ( sign / turn / sound / signal )

22. A lot of dancers go to Rio de Janeiro to .......................... the Rio Carnival ( join / perform / attend / appear )

23. I had to stand in the balcony to catch the whole ........................ off the parade ( view / picture / sight / vision )

24. Everybody attends the festival ..................... fun ( with / for / in / at )

25. On Thanksgiving, families and friends ........................ to have feast ( meet / arrive/ gather / appear )

26. The ending of the film was so ......................... ( moved / moving / move/ moveable )

27. Although they spent a lot of money on the film, it wasn't a big ........................ ( success / failure / performance / show )

28. ......................... the film was gripping, Tom slept from the beginning to the end ( However / Although / In spite of / Despite )

2

YH

Yuna Hanoe

21 tháng 4 2017

Choose the correct option for each gap in the sentences :

1.Linh used to .................... jigsaw puzzles in his free time ( do / does / doing / did )

2. My mum ....................... the bus to work every morning, but David drivers ( catches / goes / does / runs )

3. Traffic accidents can be prevented if people ......................... the rules ( remember / obey / go after / take care of )

4. You should look right and left when you go ....................... the road ( along / up / down / across )

5. Hurry up, or we'll ....................... the last bus ( lose / avoid / miss / drop )

6. Before the new system of traffic control, there ..................... be more accidents ( use to / used to / is used to / get used to )

7. Public ........................ in this city is quite good,and it's not expensive ( journey / travel / vehicle / transport )

8. ........................ isn't very far from here to the harbour ( there / this / it / that )

9. Did you read that ..................... of the Chainsaw Massacre at Halloween ? It said that the films was so gripping (review / report / summary )

11. I like the film very much ! The characters are unforgettable and the ..................... is gripping ( plot / style/ acting)

12. The film was so boring ......................., Jack saw it from the beginning to the end ( Therefore / However / Although )

13. In spite of having a happy ......................., the film begins with a terrible disaster ( ending / acting / setting )

14. I'm sure you will find the film ....................... ( amuse / amused / amusing )

15. Avatar is a 3D hit- the special ........................ are amazing ( effects / scenes / staegs )

16 " Do you feel like seeing a film ? " - ........................ ( No, I don't like it all / Sure what film shall we see / Who is in it ? )

17. If you want to know which films are on at the cinemas, you should look at the film ...................... this newspaper (section / review / report )

18. It stars Marlon Brandon as the Godfather. He won an Oscar for his ......................... as the boss ( action / performance / direction )

19. Does your bike ever ........................ down on the way to school ? ( break / take / do / turn )

20. I ........................ go on foot when I was in primary school ( have to / can / may /used to )

21. Give a ........................ before turn left or right ( sign / turn / sound / signal )

22. A lot of dancers go to Rio de Janeiro to .......................... the Rio Carnival ( join / perform / attend / appear )

23. I had to stand in the balcony to catch the whole ........................ of the parade ( view / picture / sight / vision )

24. Everybody attends the festival ..................... fun ( with / for / in / at )

25. On Thanksgiving, families and friends ........................ to have feast ( meet / arrive/ gather / appear )

26. The ending of the film was so ......................... ( moved / moving / move/ moveable )

27. Although they spent a lot of money on the film, it wasn't a big ........................ ( success / failure / performance / show )

28. ......................... the film was gripping, Tom slept from the beginning to the end ( However / Although / In spite of / Despite )

PD

pham duy ly

21 tháng 4 2017

nhìu quá!chắc là tl đc nhưng...gửi từng câu thui bn ơi!

A. MULTIPLE CHOICE: (8.0points)Find the word which has different sound in the part underlined. [0,75p]Question 1. A. loved B. closed C. changed D.lookedQuestion 2. A. head B. great C. death D. breadQuestion 3.A. healthy B. appear C. ready D. heavyFind the word with a different stress pattern from the others in each line.[ 0,75p]Question 4. A.money B.dancer C.shopping D.balloonQuestion 5.A. renewable B. plentiful C. limited D dangerousQuestion 6. A. another B. enormous C.easily D....

TA

Trần Anh Tuấn

14 tháng 5 2020

A. MULTIPLE CHOICE: (8.0points)

Find the word which has different sound in the part underlined. [0,75p]

Question 1. A. loved B. closed C. changed D.looked

Question 2. A. head B. great C. death D. bread

Question 3.A. healthy B. appear C. ready D. heavy

Find the word with a different stress pattern from the others in each line.[ 0,75p]

Question 4. A.money B.dancer C.shopping D.balloon

Question 5.A. renewable B. plentiful C. limited D dangerous

Question 6. A. another B. enormous C.easily D. abundant

II/Choose the correct option A, B, C or D to complete the sentences. [4,5pts]

Question 7. In order to save energy, don’t forget to ………… the lights before you leave.

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

Question 8. We ………… an English test this time tomorrow.

A. will be having B. will have C. have D. had

Question 9. If people need money badly, they may commit ………….

A. criminals B. criminate C. crime D. criminalist

Question 10. A friend of …………. is coming to stay with me next month.

A. me B. I C.my D. mine

Question 11. I arrived on time ………… the bad traffic.

A. in spite of B. however C. although D. nevertheless

Question 12. You live in the countryside,..............?

A. do you B. don’t you C. did you D. didn’t you

Question 13. Solar energy ………… by many countries in the world in the future.

A. use B. will use C. will be using D. will be used

Question 14. Careless driving …………accidents on the road.

A. will cause B. have caused C. is causing D. is going to cause

Question 15. My father …………to work by bus last year, but this year he drives his car to work.

A. often goes B. used to go C. gets used to going D. gets used to go

Question 16. Over population is causing …………. problems than we can imagine.

A. fewer B. less C. more D. many

Question 17. The boys….. home for lunch because they are planning to visit the hydro power station.

A.have not come B.do not come C.will not be coming D.is not coming

Question 18.It is going to rain any minute now. The children ………… in the rain.

A.is being caught B.will be caught C.is caught D.are caught

Question 19.They ………….. a test tomorrow; we don’t want to disturb them.

A.will be having B.will have C.have D.had

Question 20.They ……………… that we have gone without telling them.

A.thought B.are thinking C.will be thinking D.think

Question 21.........you ………….. up this book for me, please?

A.Are … going to wrap B.Will … be wrapping C.Will … wrap D.Have … wrapped

Question 22.We …………….. to school two years ago. Now I go to school on foot. A.used to cycle B.cycled C.was cycling D.went

Question 23.My father used to go to work by motorbike. Now he …………………….. A.cycled B.was cycling C.cycles D.used to cycle

Question 24…………………. the film is a bit frightening, I really enjoyed it.

A.However B.Nevertheless C.Although D.Despite

1

IB

Ice Bear

20 tháng 5 2020

question 1 d looked bởi vì ed của look đọc là /t/. ba cái còn lại là /d/

2 b 3a

còn lại mình ko biết