căn 5-x=2

17. ................ you study harder, you will not win a scholarship.

A. Unless        B. Because      C. If                D. In order that

18. The country air is fresh. .................., it is not polluted.

A. However    B. Moreover    C. Whenever   D. Beside
19. ................ she spoke slowly, I couldn't understand her.

A. Since          B. Although    C. If                D. As
20. He never goes to bed .................... he finishes his homework.

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

      21. She is looking for a new job ……………... she is tired of doing a routine job day after day.

 A. since          B. as                C. because       D. all are correct

22. She can't marry her cousin .................. she loves him.

A. though        B. so                C. despite        D. because
23. He's still going to school ………........ his injury.

A. even though                       B. although     C. in spite of   D. even
24. He left home early .................. he could arrive at the station on time.

A. because of  B. in order to   C. although     D. so that
25. We will wait here ................ he comes back.

A. while          B. until            C. before         D. after
26. Thousands of people came to see the Queen ................ the rain.

A. because       B. owing to     C. in spite of   D. according to
27. We could reach the house .................. the road was flooded.

A. although     B. whether      C. as if             D. even
28. You have to make up your mind fast, ............... you slip the best opportunity.

A. and             B. so that         C. if                 D. or

29. My mother looks ............. she is tired. Perhaps she didn't sleep well last night.

A. like                                     B. although                 C. until                        D. as if

30. Our teacher speaks slowly ................... we may understand him.

A. because       B. in order to   C. so that         D. or

Cho ABC vuông cân tại A, AH vuông góc BC, M là đương trung điểm AC. Đường thẳng đi qua A vuông góc BM tại K cắt BC tại D. AH cắt BM tại I
a, AD.BD=BK.AH
b, Tính góc DKH
c, Từ C kẻ đường thẳng song song với AD cắt tia BA bởi E. CHứng minh tam giác MAE vuông cân
d, DI cắt AB tại N. Chứng minh ND là tia phân giác góc KNH

20. Were you aware _____  the regulations against smoking in this area ?

21. One meter is approximately equal _____  a yard.

22. Jane doesn't spend much money _____ clothes.

23. She always takes good care _____ her children.

24. William insists _____  getting up early, even on weekends.

25. What does this symbol refer_____  ?

26. The accident resulted _____ several minor injuries.

27. Congratulations _____ your success!

28. Mrs. Liz was accused _____ having stolen the car.

29. We are here to provide you _____ the best service possible.

30. He has been absent _____ school very often lately.

31. Vehicles also account _____  air pollution in the cities.

32. Last night I was invited _____  a formal get-together and I enjoyed myself a great deal.

33. The police blamed the mother_____ neglecting her child.

34. They prevented me _____  talking to that woman .        

35. Take the number 7 bus and get __________ at Forest Road.

36. If you want to join this club, you must__________ this application form.

37. The water company will have to_______ off water supplies while repairs to the pipes are carried ___________.

38. He wanted to______ off all his work before he came to the cinema with us.

39. They were 30 minutes later  because their car _______ down.

40. That problem is _______ them. We can’t  make _______ our mind yet.

1. It was the third time in six months that the bank had been held _____ .

2. I always run _____ of money before the end of the month.

3. It's taking me longer to get _____ the operation than I thought.

4. I've just spent two weeks looking _____an aunt of mine who's been ill.

5. I've always got _____ well with old people.

6. It's very cold in here. Do you mind if I turn _________ the heating?

7. They've _____ a new tower where that old building used to be.

8. Stephen always wanted to be an actor when he ________ up.

9. The bus only stops here to ________ passengers.

10. If anything urgent comes _____, you can contact me at this number.

11. Your daughter's just started work, hasn't she? How's she getting _____?

12. We had to turn _______ their invitation to lunch as we had a previous engagement.

13. While driving to work, we ran out____ gas.

14. He died ____  heart disease.

15. The elevator is not running today. It is ________  order.

16. I explained ____   him what it meant.

17. Pasteur devoted all his life _______ science.

18. House cats are distantly related ___ lions and tigers.

19. Is this type of soil suitable ___ growing tomatoes ?

20. Were you aware _____  the regulations against smoking in this area ?

II. Choose the word or phrase in each of the following sentences that needs correcting.

31. I asked him how far was it to the station if I went there by taxi.

          A                            B                            C                         D

32. They asked me that I could do the shopping for them.

                               A            B        C                  D

33. Her mother ordered her do not go out with him the night before.

                             A                   B                      C                       D

34. She said that the books in the library would be available tomorrow.

               A                           B                        C                            D

35. He advised her thinking about that example again because it needed correcting.

                 A                      B                                     C                                      D

III. Change each of the following sentences into reported speech.

36.  John said, “I want to attend a famous university.”

  à John said ________________________________________________

37. “I’m looking for the book you gave me last week,” Mary said to Peter.

 à Mary told Peter_____________________________________________

38.  Janet said to John, “I did not promise to send you a telegram.”

  à Janet _____________________________________________________

39. “I will get myself a drink,” she said.

  à She said ___________________________________________________

40. “I cannot drive them home,” he said.

  à He said _____________________________________________________

41. “Peter, do you prefer tea or coffee?” she said.

  à She _______________________________________________________

42. “The film began at seven o'clock,” he said.

  à He said ____________________________________________________

43. The father said, “I was on a business trip the whole day yesterday.”

  à The father ___________________________________________________

44. “My brother will get married next month,” James said.

  à James ______________________________________________________

45. Henry said to his mother, “Come and spend a week with us.”

  à Henry told __________________________________________________

46. He said to me, “Keep a seat for me in the lecture hall.”

  à He _________________________________________________________

47. Mike said to Henry, “Give me my book back, please.”

  à Mike ______________________________________________________

48. “Don't play on the grass, boys,” she said.

  à She _________________________________________________________

49. “Don't make so much noise,” he said.

  à He ___________________________________________________________

50. Jane said to Mary, “Will you be free tomorrow?”

  à Jane asked _____________________________________________________

18. He asked _______ him some money.

          A. her to lend              B. her lending             C. she has lent               D. she lends

19. Andrew told me that they _______ fish two_______ days.

          A. have not eaten / ago                                   B. had not eaten / previous   

           C. did not eat / before                                     D. would not eat / last

20. John often says he _______ boxing because it _______ a cruel sport.

          A. does not like / is                                          B. did not like / were     

          C. not liked / had been                                    D. had not liked / was

21. The host asked Peter _______ tea or coffee.

          A. whether he preferred                                 B. that he preferred          

          C. did he prefer                                                D. if he prefers

22. The mother asked her son _______.

          A. where he has been                                      B. where he had been        

          C. where has he been                                      D. where had he been

23. “Please don't tell anyone what happened," Ann said to me.

A. Ann said to me please don't tell anyone what happened.                  

B. Ann told me didn't tell anyone what had happened.

C. Ann said me not to tell anyone what happened.                  

D. Ann told me not to tell anyone what had happened.

24. “Would you like to go to the cinema with me tonight?” he said.

A. He invited me to go to the cinema with him that night.      

B. He offered me to go to the cinema with him tonight.

C. He asked me if I'd like to go to the cinema with him tonight.

D. He would like me to go to the cinema with him this night.

25. “Remember to pick me up at 6 o'clock tomorrow afternoon” she said.

A. She told me to remember to pick her up at 6 o'clock tomorrow afternoon.

B. She reminded me to pick her up at 6 o'clock the following afternoon.

C. She reminded me to remember to pick her up at 6 o'clock the next afternoon.

D. She told me to pick her up at 6 o'clock the next day afternoon.

26. “If I were you, I'd tell him the truth,” she said to me.

A. She said to me that if I were you, I'd tell him the truth.       

B. She will tell him the truth if she is me.

C. She suggested to tell him the truth if she were me.              

D. She advised me to tell him the truth.

27. “I'm really sorry for being late again,” said Ann.

A. I felt sorry for Ann's being late again.                         

B. Ann was sorry for my being late again.

C. Ann excused for my being late again.                         

D.  Ann apologized for being late again.

28. “How beautiful the dress you have just bought is!” Peter said to Mary.

A. Peter promised to buy Mary a beautiful dress.        

B. Peter said thanks to Mary for her beautiful dress.

C. Peter complimented Mary on her beautiful dress.       

D. Peter asked Mary how she had just bought her beautiful dress.

29. “Can I bring a friend to the party?” Nancy wanted to know.

A. Nancy asked me if she could bring a friend to the party.   

B. Nancy wanted to ask someone to bring her friend to the party.

C. Nancy knew that bring a friend to the party was good.      

D. Nancy wanted to invite her friend out and to the party.

30. She asked me, "How high is the church?"

A. She asked me how high the church was.                     

B. She asked me how high is the church.

C. She asked me how high the church had been.                                                       

D. She asked me how high the church is.

Cho tam giác ABC nhọn AD, Be, CI là các đường cao, H là trực tâm
a, Chứng minh tam giác CED song song tam giác CBA
b, Chứng minh DA là phân giác IDE
d, M là giao điểm của ID và BK. Chứng minh HM .BE = BM.AE

Hòa tan 7g hỗn hợp gồm Al, Fe và Cu trong dung dịch H2SO4 dư. Phản ứng kết thúc thấy trong bình phản ứng còn lại 1,5g chất rắn và thu được 4,48 lit khí(đktc). Tính % mỗi kim loại trong hỗn hợp ban đầu