Cho phân số a/b có b - a = 18. Phân số a/b sau khi rút gọn thì được phân số 91/100 .Tìm phân số a/b

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1.He chained up the lioness at night___________ could frighten anyone. A. so that he B. in order that she C. for fear that she D. for her not to 2. The burglar cut the telephone wires____________ call the police. A. so that he can B. in order that I could C. for fear that I D. for me not to 3. The manufacturers have made the taps of their new gas cooker very stiff _________ young children not to be able to turn them on. A. so that B. in order that they wanted C. for fear that D. for 5. I am putting the nets over my strawberry plants_______ the birds can eat all the strawberries. A. so that B. in order that C. for not D. for fear that 6. The ceiling is ______. A. too high for me to reach B. too tall for me to reach C. so high for me reaching D. enough high of me to reaching 7. He goes to England_____. A. so that he learns English B. so that he may learn English C. so to learn English D. so he learns English 8. It was too late _____. A. to go for them to the party. B. for them to go to the party. C. because they go to the party. D. so they go to the party. 9. She hid the present______ _______. A. so that the children wouldn’t find it B. in order to the children not to find it C. for the children not find it D. in order that the children not to find it 10. “We preserve natural resources. We can use them in the future.” means_____. A. We preserve natural resources so that we can use them in the future B. We preserve natural resources so as to we can use them in the future C. We preserve natural resources in order to we can use them in the future D. We preserve natural resources for fear that we can use them in the future 11. The teacher was explaining the lesson slowly and clearly_____. A. to make his students to understand it B. in order that his students can understand it C. so as to that his students could understand it D. so that his students could understand it 12. I am not _____ a car. A. rich enough to buy B. too rich enough to buy C. too poor to buy D. enough rich to buy 13. _______ to go to the cinema. A. it was late so that B. that it was late C. it was too late D. such too late 14. The piano was too heavy ______. A. for nobody to move B. for nobody to moving C. for anyone to move D. for anyone to moving 15. The school boys are in hurry ______ they will not be late for school. A. so as to B. to C. in order that D. for 16. He turned off the lights before going out _____ waste electricity. A. so that not B. as not to C. in order that not D. so as not to 17. The film was ______ through. A too long for us to see B. very long for us to see it C. too long for us seeing it D. too long enough for us to see 18. The coffee was _____ to drink. A. so strong B. strong C. enough strong D. too strong 19. Mary jogs everyday ______ lose weight. A. so she can B. so that she can C. because she can D. so that to 20. He was playing very softly¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬_____________ he _____________ disturb anyone. A. in order that / couldn’t B. so that / can’t C. so that / could D. so/ can 21. I sent him out of the room _________discuss his progress with his headmaster. A. for B. in order to C. so as D. in order that 22. He sent his children to the school__________ get more knowledge. A. for him to B. to for them C. so as for them to D. so that he could