Cho 3 tia ox, oy, oz cắt 2 đường thẳng song song m, m' lần lượt tại A, A' ∈ ox B, B'∈ oy ; C, C' ∈ oz. Chứng minh rằng \(\frac{AB}{A'B'}=\frac{BC}{B'C'}\)

Read the following passage, then choose the correct answer to questions 26- 30.

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The invention of the phonograph happened quite by accident. Thomas Edison moved to Menlo Park,
New Jersy in 1876, where he established an industrial research laboratory. There, Edison was working on a
carbon telephone transmitter to improve the existing Bell telephone system.
In that laboratory a year later, Edison invented the phonograph while he was trying to improve a
telegraph repeater. He attached a telephone diaphragm to the needle in the telegraph repeater; in this way, he was
able to reproduce a recording that could be played back. After he made some improvements to the machine, he
tested it. He recited “Mary Had a Little Lamb” into the machine and played his voice back to a very surprised
audience.
26. What is the best title for the passage?
A. Thomas Edison’s many inventions B. Improvements in telephone and telegraph
C. The History of Menlo Park D. An accidental invention
27. In what year did the invention of phnograph occur?
A. 1876 B. 1877 C. 1878 D. the article does not say
28. What was Edison working on when he created the phonograph?
A. A telegraph repeater B. A telegraph diaphragm
C. A telephone repeater D. A telephone diaphragm
29. According to the passage, how was the phonograph made?
A. With a telephone needle and a recorder B. From a recording of a telegraph
C. With only a telegraph repeater D. From a combination of telephone & telegraph part
30. According to the passage, how did Edison test his new invention?
A. He made improvements to the machine. B. He used a carbon transmitter.
C. He read a children’s rhyme. D. He produced the audience voice.

Choose the best answer from the four options given (A, B,C, or D) to complete each sentence.
6. Lan wishes she_________a long vacation.
A. has B. had C. have D. having
7. He saw that film_________7.00 p.m_________Sunday.
A. on-from B. in-at C. at-at D. at-on
8. You like watching sports, _________, Peter?
A. do you B. aren’t you C. don’t you D. doesn’t he
9. You shouldn’t eat_________. It’s not good for your health.
A. quick B. quickly C. fastly D. slow
10. Minh got wet_________he forgot his umbrella.
A. so B. because C. and D. therefore
11. The girl_________is standing near the window is my sister.
A. who B. when C. where D. in which
12. We_________Nam since he left school.
A. met B. meet C. meeting D. haven’t met
13. Do you mind_________me home?
A. taking B. take C. took D. to take
14. This building_________in 1980.
A. built B. builds C. was built D. is built
15. She asked me_________ at English.
A. if I was good B. if was I good C. if I good D. if I am good
16. If you_________your passport, you will be in trouble.
A. lost B. lose C. would lose D. losing
17. What’s the name of the man_________gave us a gift?
A. he B. which C. who D. whose
18. The librarian asked us_________so much noise.
A. not to make B. no make C. not making D. don’t make
19. We have lived in this flat_________five years.
A. ago B. for C. since D. already
20. I really enjoyed the disco. It was great, _________?
A. isn’t it B. is it C. wasn’t it D. weren’t it