Cho hình chóp SABC có G là trọng tâm của tam giác ABC. Trên đoạn 5A lấy hai diem M, N sao cho SM = MN = NA

a) Chứng minh: GM // (SBC)

b) Gọi D là điểm đối xứng của A qua G. Chứng minh: (MCD) // (NBG).

c) Gọi H = DM \(\cap\) (SBC). Chứng minh H là trong tâm \(\Delta SBC\)

Cho hình chóp SABCD có đáy ABCD là hình thang với AD là đáy lớn và AD = 2BC. Gọi O là giao điểm của AC và BD. G trọng tâm của tam giác SCD.

a) Chứng minh OG // (SBC).

b) Gọi M là trung điểm của cạnh SD Chứng minh: CM // (SAB)

c) Giả sử điểm I trên đoạn SC sao cho 2SC = 3SI . Chứng minh: SA // (BID).

d) Xác định giao điểm K của BG và mặt phẳng (SAC). Tính tỉ số \(\dfrac{KB}{KG}\)

Choose the best answer:

14 . There aren't......car parks in the mountainous and remote countryside of Vietnam. (some/many/much/plenty of)

15.Because their family is very poor, the children have........toys. (few/many/little/much)

16. This club needs to win...... ..trophies in order to be regarded as the best club in EUROPE.(a lot/ a good deal of/much / a number of)

17. .........student has a mobile phone but I only allow them to turn it on during breaks. (each / little/all/ every)

18. Despite the fact that the weather was bad,.................all of Jason's friends came to congratulate him. (most/almost/ the most/mostly)

19.I need to go to the greengrocer.There are....... potatoes left (little/ few / a little/many) 

20..........of the people in the department are working hard to meet the deadline of the project. (Most / Almost / The number/ A great deal)

30. There is not... ..international news in local papers today. (any/ some/both / every)

31. There is...... ..useful information in that thick book. You should read it. (much/ every/many/ a few) 
32. Nick has..... .nonfiction books but he never reads them (a number of a great deal of/ much/ few)

33. .......grade 12 students are looking forward to the result of their first test in the year.( much/all amount of /a little)

34. .......people can speak more than one language but not all of them are fluent speakers.(much/many/few/a great deal of

Choose the best answer:

1.Because our parents took good care of us, we had. ..... problems n our young life. (few /several/ many / quite a few)

2.Natasha likes white coffee, so she usually adds .......milk whenever she has a cup.(several/little/ a few lots of)

3.I just need.. .....more minutes to finish this exercise. (other / a little/little/ another)

4........... piece of furniture in that living room is made of precious wood. (many / some / every/much)

5.

5.Only.... ..of the homeless people can read and write properly. ( a few/many/little/most)

6. ..........students work hard for their exams so that they can get high marks (Most/ A great deal/Few / Most of)

7. .........computer in this classroom is equipped with a modem and a CD-ROM. (several / many / each/ most) 

8 . The lecturer often gives his students........time to prepare for their presentation. ( a number of plenty of/ a few / many)

9. .........student in this class is taking advanced English course. (Many/ All/Every/Most)

10. ........all of my kids go to bed before 9 pm every night. (Almost/Mostly / Most / The most)

11. ........winner received a present of honor from the organizing committee. (all / every / some / most)
 12. The film was very boring, so...... ...people stayed until the end. (many / a little/ very few / most)

13.. .........my favourite places in the world is a small town called Katherine in the north of Australia. (one / one of/each / every)

Put another/other/ the other/ the others/ others

11. She was an excellent engineer. Everyone agreed it would be hard to find .... like her

12. Mr.Paul has three children. One of them is a girl and .... are boys.

13. Some students of mine like Math ...... prefer Literature.

14. There are nine pencils on the desk. One is blue, one is red and are black......
15. Do you want to exchange this pen for ...... or do you want your money back? 
16. Some scientists think we should reduce the number of flights to prevent global warming.....disagree.
17. The headquarters of the company is located on......... side of the street, directly opposite.

18. The plan has been opposed by schools, business and ......local organizations.

19. He turned down the offer on grounds of his health, but I think there were some........... reasons behind his deccision.
20. Some people like to rest in their free time,......... like to travel

Put another/other/ the other/ the others/ others

 1. I have already watched this film twice, so I want ...one

2. I can play two music instruments. One is guitar and ... is violin

3.She had a book one hand and a laptop in ........

4.Laura and Min are listening to the radio ....... girls are out.

5.I don't like those books.Could you show us some ......?

6.I'm finding one of my pink shoes, but I can't find .......

7.Some groups like to play sports in their free time ...... like to read books

8.The English center is on .... side of the street.

9.There were six pencils on my desk. Two are here. Where are ........?

10.Some of the students went straight to classroom. ...students are still hanging around.

My plans to create a tiny car made of glasses were unsuccessful, so I guess it's back to the ... board for me

A.drawing B.painting C.clearing D.cleaning

Some of them want to go shopping and .... prefer to watching TV

A.the other B.others C.the others D.others

he got 10 marks in the final test. no .... students has ever achieved that

A.the others B.other C.others D.the other

minh .... changed nothing so I could recoginze him easily

A.most B.almost C.the most D.mostly

Question 51: She last went to the cinema with us two years ago.

=>She has......

Question 52: " Where did you go last night ?" she asked.

➡She asked...

Question 53: My brother was busy with his project. He couldn't attend the party with me.

=>If..

Question 54: A lot of people came to the stadium to watch the match though it rained heavily

➡However

Question 55: They began playing badminton when it stopped raining.

=>They have..

Question 56: Immediately after arriving at the station, he was arrested by the police.

➡ Hardly

Question 57: "Did you water the trees in the garden yesterday, Nam? The man asked.

=>The man asked

tìm và sửa lỗi

1. She (A) should go (B) out late (C) at night because of danger 

2.She (A) have to speak English (B)well (C) because her current job (D) needs it has to must 

3. (A) You must wear a helmet when you (B) ride a motorbike, (C) otherwise you will (D) be punished

4.He (A) oughtn't to find another (B) solution to this problem if he (C) doesn't want to get (D) fired

5.. You (A) ought to stay up (B) at night, (C) which is (D) not good for your health

6. We (A) haven't to (B)buy souvenirs (C) for Sally. She (D) doesn't like them 7. You (A) don't have to use (B) mobile phones (C) in the class because of their (D) negative effects

1.It is a good idea for me to do voluntary work

=> I ................

2.It is unnecessary for us to book seats for the theatre in advance

=> We .............

3.my parents never let me forget to do my homework'

=> my parents always ............

4.They don't allow me to stay overnight at my friend's house

=>they don't let............

5.he is interested in participating in social media

=>he is keen ...

6.his mother fobides him to play computer games

=>his parents don't allow .........

7.It's obligatory for every employee to keep the company's information secret

=>every employee ..............