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cho A= 3+3^2+3^3+....+3^2004 chứng minh rằng A chia hết cho 130
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Put “if” or “unless” into these spaces. 1/ ________ we hurry, we’ll miss the bus. 2/ Will you phone me ________ you come to England ? 3/ ________ you see Jane, ask her to contact me. 4/ You’ll never pass your exam ________ you don’t work harder. 5/ Liverpool won’t win ________ they begin playing better. • Use “if” in place of “unless” 1/ We won’t go out unless it stops raining. -________________________________________________ 2/ I will call the police unless you give back my bicycle. -____________________________________________________________ 3/ You wouldn’t be able to do this exercise unless your English were good. -____________________________________________________________ 4/ Unless we had enough rain, we couldn’t grow rice. -____________________________________________________________ 5/ The fishermen couldn’t have caught a lot of fish unless they had had good nets. -____________________________________________________________

IV. Choose the best answer Malaysia is one of the countries of the Association of South East Asian Nations (ASEAN). It …1….. into two regions, known as West Malaysia and East Malaysia. They are separated by about 640 kni of the sea and together comprise an area of 329,758 sq km. Malaysia …2…….. tropical climate. The Malaysian unit of currency is the ringgit, consisting of 100 sen. The …3……. of Malaysia is Kuala Lumpur and it is also the largest city in the country. The population in 2001 was over 22 million. Islam is the country’s official religion. In addition, there are other …4… such as Buddhism and Hinduism. The national language is Bahasa Malaysia (also known simply as Malay). English, Chinese, and Tamil are also ……5…….. spoken. The language of instruction for primary school children is Bahasa Malaysia, Chinese, or Tamil. Bahasa Malaysia is the primary language of instruction in all secondary schools, although some students may continue learning in Chinese or Tamil. And English is a …6………. second language. 1. A. divides B. is divided C was divided D. was dividing 2. A. enjoys B is enjoyed C. was enjoying D. is enjoying 3. A. river B. nation C. countryside D.capital 4. A. rules B. regulations C.religions D. behaviors 5. A. widely B. generally C. usually D. narrowly 6. A. important B. necessary C. compulsory D. optional

• If I ……….a lot of money now, I …………..a new car. a. have /will buy b. have / would buy c. had/ will buy d. had/ would buy. 2. If I ……………you, I …………….do that. a. am/ will b. were /would c. were/ will d. had been/ would. 3. if I were offered the job, I think I ………. it. a. take b. will take c. would take d. would have taken. 4. I would be very surprised if he…………….. a. refuses b. refused c. had refused d. would refuse. 5. Many people would be out of work if that factory………..down. a. closes b. had closed c. closed d. would close. 6. If she sold her car, she ………… much money. a. gets b. would get c. will get d. would have got. 7. They would be disappointed if we……………. a. hadn’t come b. wouldn’t come c. don’t come d. didn’t come. 8. Would John be angry if I ……. ……his bicycle without asking? a. take b. took c. had taken d. would take. 9. She ……….terrible upset if I lost this ring. a. will be b. would be c. were d. had been. 10. If someone…………in here with a gun, I would be very frightened. a. would walk b. walks c. had walked d. walked. 11. What would happen if you ……………..to work tomorrow? a. don’t go b. didn’t go c. won’t go d. wouldn’t go. 12. We ‘ll get wet if we ………….out. a. go b. did go c. went d. had gone. 13. If I go shopping, I ………some food. a. buy b. will buy c. would buy d. would have bought. 14. If I find it, I ………you. a. will tell b. would tell c. had told d. told. 15. What would you do if you……………a million dollars? a. would win b. win c. had won d. won. 16. They ‘d be hurt if I ………………. a. don’t go b. didn’t go c. hadn’t gone d. wouldn’t go.

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