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Chứng minh rằng: (a ³+b ³+c ³)(1/a + 1/b + 1/c) ≥ (a + b + c) ² với a, b, c > 0
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5. Choose the best answer A, B, C or D to complete the sentences. 1. There are some things Americans would change, and ____ thing people would change is their education. A. the biggest B. a big C. the D. a bigger 2. ____ people from England who went to live in North America nearly 400 years ago were called Pilgrims. A. a B. x C. an D. the 3. In our tradition, when people mention "matter of betel and areca” they are talking about ____ issue. A. unmarried B. married C. marry D. marriage 4. Cultural diversity makes our country ____ by making it a ____ place in which to live. A. rich - more interesting B. richest - most interesting C. richer - most interesting D. richer - more interesting 5. These people wanted to start ____ new life in ____ new country, but they faced a lot of difficulties because they didn't know anything about the new land. A. a – a B. a – a C. a – the D. the – a 6. Nations where there is much cultural diversity can also sometimes be known as a ____. A. multi-ethnic society B. multidimensional problem C. multicultural society D. cultural uniformity 7. In Portugal, walking backwards will bring bad luck, because it paves ___ way for ____ devil to enter. A. the - the B. a - the C. a - a D. the - a 8. The Pilgrims didn't know how to grow ____ food or build __ homes, so a lot of them became very ill. A. a - a B. X - X C. a - the D. the - a 9. To many ____ street vendors, the success of their day is determined by how it starts and by their first customer. A. superstitiously B. supernatural C. superstition D. superstitious 10. In Russia, there is ____ belief that unmarried people should avoid sitting at ____ corner of ____ table because they will find difficulties finding their life partner and will not get married. A. a - the - the B. the - the - the C. a - a - a D. a - a - the 11. On one spring day, ____ Pilgrims met two native Americans, Squanto and Samoset, who could speak English. A. an B. the C. a D. x 12. One Chinese legend has it that the Jade Emperor asked for twelve representatives of the animal species on Earth to be brought to his ____ kingdom. A. heavenly B. sky C. heaven D. space 13. Before the wedding, the groom usually asks his best friend to be his ____, and the bride may have one or more ____. A. best man - bridesmaids B. best man - housemaids C. closest man best maids D. good man - best maids 14. Squanto and Samoset became ____ friends with the Pilgrims and gave them a lot of ____ advice about how to grow food and build homes to make their lives easier. A. a - a B. X - X C. a - the D. the - a 15. However, another version says the ____ of the 12 animals in the Chinese horoscope was decided thousands of years ago by Buddha, who called for a New Year's meeting of animals. A. site B. pan C. order D. position

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