Số lít nước thùng lớn chứa là:

(750-112):2= 319(l)

Số lít nước thùng bé chứa là:

319+112=431(l)

Đáp số: thùng lớn chứa 319l nước

            thùng bé chứa 431l nước

Gọi x là thời gian 2 xe gặp nhau kể từ khi xe 2 khởi hành (giờ,X∈N*)

Quãng đường xe 1 đi sau 1h là: 40.1=40(km)

Quãng đường xe 1 đi tiếp đến chỗ 2 xe gặp nhau là: 40x(km)

Quãng đường  xe 2 đi từ B đến chỗ 2 xe gặp nhau là: 50x(km)

Vì quãng đường AB dài 130km nên ta có phương trình:

40+ 40x + 50x = 130

<=> 90x=90

<=> x=1(nhận)

Vậy từ khi xe 2 khởi hành 2 xe gặp nhau sau 1 giờ

42. You/ fall/ your arms/ the stairs./ you/ when/ and/ break/ may/ run down/

You may fall and break your arms when you run down the stairs.

43. Mary/ visited/ interesting/ some/ places/ Da Nang/ in/ last weekend.
Mary visited some interesting places in Da Nang last weekend.

44.  would/ Which/ you/ like/ place/ to/ visit,/ Vung Tau/ or Nha Trang?

Which place would you like to visit, Vung Tau or Nha Trang?

45. King Hung/ An Tiem/ and let/ family/ his/ go/ home./ about/ back/ and/ In the end,/ heard/ the story

In the end, King Hung heard about the story and let An Tiem and his family go back home.

1.     There was a high level of competitive____activity_____________ in certain areas.(act)

2.    Today the prosperity of Skipton depends on the car parks for tourists,______visitors_______and shoppers.(visit)

3.    This _____foreigner____________was born in Japan, as were his parents.(foreign)

4.    The__correspondents________ take pride in their wordsmanship and don't mind twirling it.(correspond)

5.    It is estimated that 20,000 jobs will be lost as part of the efforts to_________modernize_________ the forces.(modern)

6.    Visitors were most______impressed__________by the enthusiasm and commitment of pupils, teachers and all concerned.(impress)

7.    It is a______beautiful____________designed volume, with illustrations of the covers of his various books.(beauty)

8.    I was overwhelmed by the__friendliness__of the people here. (friend)

9.    This film is_______enjoyable________and visually gratifying.(enjoy)

10. The baby slept_____peacefully__________in its cradle. (peace)

11. He also says the development would lead to more noise and_____atmospheric_____________pollution.(atmosphere)

12. In addition, some firm encounter difficulties in understanding the new rules of the game.(difficult)

13. At each shrine you pause, and you say some_____prayers__________and you greet each deity.(pray)

14. In 1962, Jamaica became an____independent______country after 300 years of British rule.(independ)

15. I love all the___differences_________ between people in different parts of the country.(different)

16. ‘The country is______famous_________for its natural beauty. (fame)

17. The___recreation______of the Famine ship took place at Blennerville, near Tralee, Co Kerry. (recreate)

18. Her voice was full of____worshipful___________admiration.(worship)

19. With neither fame nor letters of___invitations__________, they had to ask friends for help.(invite)

20. As for his name, I hardly think a formal __introduction______was necessary.(introduce)

1. We went out for _____ meal last night.  _____ restaurant we went to was excellent.

A. a/ The                    B. the/ A                                C. a/ ∅                                   D. the/ ∅

2. As I was walking along the street, I saw _____ $10 note on _____ pavement.

A. a/ a                         B. the/ the                              C. a/ the                                 D. the/ a

3. _____ actress’s life is in many ways unlike that of other women.

A. An                          B. A                                        C. As                                      D. That the

4. Kate plays _____ violin in an orchestra.

A. the                         B. a                                         C. an                                       D. ∅

5. _____ computer has changed _____ way we live.

A. A/ the                    B. The/ the                             C. A/ a                                    D. The/ a

6. Excuse me, where is _____ bus station, please?

A. a                             B. the                                      C. ∅                                        D. an

7. What did you have for _____ breakfast this morning?

A. a                             B. an                                       C. the                                      D. ∅

8. Peter used to work in _____ Middle East.

A. ∅                           B. the                                      C. an                                       D. a

9. My plane was delayed. I had to wait at _____ airport for three hours.

A. the                         B. a                                         C. an                                       D. ∅

10. I have _____ problem. Can you help me?

A. ∅                           B. a                                         C. an                                       D. the

11. Barack Obama is _____ President of _____ United States.

A. the/ the                  B. a/ ∅                                   C. the/ ∅                                D. the/ an

12. He never listens to _____ radio. He prefers watching _____ television.

A. a/ a                         B. a/ the                                 C. the/ ∅                                D. ∅/ the

13. _____ university will be built in _____ center of the town.

A. A/ the                    B. An/ the                              C. The/ a                                D. An/ a        

14. _____ River Nile is _____ longest river of all.

A. ∅/ Æ                     B. A/ the                                C. The/ the                             D. ∅/ a

15. _____ Women’s Day is on _____ eighth of March.

A. The/ ∅                  B. ∅/ the                                C. The/ an                              D. ∅/ an

16. By _____ time we had just left the office, _____ alarm went off.

A. ∅/ the                   B. a/ an                                   C. a/ the                                 D. the/ an

17. He grew up in _____ orphanage in _____ United Kingdom.

A. the/ ∅                    B. an/ an                                C. the/ an                               D. an/ the

18. Laura is friendly. She can make _____ friends easily.

A. a                             B. an                                       C. the                                      D. ∅

19. That car can run at _____ speed of 180 miles _____ hour.

A. the/ an                   B. a/ the                                 C. a/ a                                     D. the/ a

20. _____ experience is _____ best teacher.

A. An/ the                  B.∅ / the                                C. the/ the                              D. an/ an

Gọi x là chiều rộng khu vườn ban đầu(m;x>0)

Chiều dài khu vườn ban đầu:2x(m)

Diện tích khu vườn ban đầu: 2x.x=\(2x^2(m)\)

Chiều rộng khu vườn lúc sau:x+4(m)

Chiều dài lúc sau:2x-6(m)

Diện tích khu vườn lúc sau:(2x-6)(x+4)=\(2x^2-6x+8x-24=2x^2+2x-24(m)\)

Vì diện tích không thay đổi nên ta có phương trình:

\(2x^2=2x^2+2x-24\)

<=>2x-24=o

<=>2x=24

<=>x=12(nhận)

Vậy chiều rộng khu vườn ban đầu là 12m

Chiều dài khu vườn là 12.2=24m

7.He is not tall enough to play basketball.

8.It was such awful weather that i couldn't go swimming.

9.Tuan,whose father is a doctor,is my boyfriend.

10.Unless it isn't sunny,we will go swimming.

11.The car is too expensive for him to buy.

`12.Lan speaks English the most fluently in the class.

C.6m

1. How far is it from here to the nearest post office?

2.How far is it from New York to California?

3. How far is it from your house to your family store?

4. How far is it from Beijing to Berlin ?

5.How far is it from your hotel to the beach ?

19. It's years since she last wrote to me.

20. It's ten years since Robert and Catherine were married .