chứng minh rằng với mọi số tự nhiên n các phân số sau đây là phân số tối giản 2n+1/2n+3

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Mình đang cần gấp nên mong mọi người giúp ạ. Xin cảm ơn. 1. Passover is a festival …………… is celebrated by all Jewish people. A. where B. which C. who D. whom 2. What is the name of the man …………… gave us a lift? A. he B. whom C. who D. which 3. Atlanta is the city …………………… the Olympic Games were held. A. that B. when C. where D. which 4. I went to the library, but I didn’t find the book I needed. A. that I needed B. I needed it C. that I needed it D. of which I needed 5. My mother is a person …………… tremendously. A. which I admire B. whom I admire C. I admire her D. who I admire her 6. The scientist …………… we met yesterday is very well known. A. which B. where C. whom D. whose 7. The picture reminds him of the time …………… he studied in New York. A. which B. when C. where D. why 8. Mike comes from a city …………… is located in the southern part of England. A. where B. who C. when D. that 9. The children …………… attend that English school receive good education. A. who B. whom C. which D. whose 10. Nam Dinh province, …………… my uncle lives, often has hurricanes. A. when B. where C. which D. that 11. I think doctors …………… work in disaster areas are both unselfish and very brave. A. who B. which C. they D. those 12. 2005 was the year …………… there was a big earthquake in Indonesia. A. which B. where C. who D. when 13. Mai is the girl …………… mother is an architect. A. who B. whose C. which D. that 14. A snake or a spider is the animal …………… she’d like to keep as a pet. A. where B. what C. that D. when 15. My older brother, …………… was twenty-two last month, has gone to work in India. A. who B. that C. he D. which