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hongthuanchau
2 năm trước
Cho a,b,c là các số không âm. Cmr: $a+b+c \ge 3\sqrt[3]{abc}+max\{(\sqrt{a}-\sqrt{b})^2;(\sqrt{b}-\sqrt{c})^2;(\sqrt{c}-\sqrt{a})^2\}$
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1. It always_________in this region in November. A. rains B. rained C. is raining Has rained 2. Nowadays, most children______cartoon films and games. A.likes B. like C. is liking D.have liked 3. Where is Mary? – She _______ for the dinner in the kitchen at the present. A.prepares B. prepared C. is preparing D. has prepared 4. I ______ my motor’s rear mirror recently. A. break B. broke C.am breaking D. have broken 5. She ______int he computer at 4:00 p.m yesterday. A.is working B. was working C.worked D. had worked 6. Water______of hydrogen and oxygen. A.consists B. consist C. is consisting D.has consisted 7. Do not give chocolate to Helen. She _______it very much. A.hated B.hates C.is hating D. has hated 8. The Sun _____us heat and light. A.gives B.gave C. have given D.will give 9. We______students, so we______go to school on weekdays. A. are/often goes B. were/often go C. are/often go D.has been/often went 10. Cats______milk, but birds_______. A.like/don’t like B.liked/ hasn’t liked C. likes/ doesn’t like D. will like/don’t like 11. Every day, Sarah_____her children to school and then ______home to prepare lunch. A.takes/will return B. has taken/returns C. takes/returns D. take/has returnes 12. The Sun____the ball of fire in the sky that the Earth ____round. A.is/goes B.is/is going C. was/was going D.was/went 13. Many people______living in the Seatle because it_____ continually. A.hate/often rained B.hate/often rains C.hated/ rains often D. hated/often rained 14. Listen! Mr. John______the piano. You ______so much noisy. A.plays/ should not make B. is playing/ should not make C.was playing/ do not make D.has played/ don’t make 15. Right now, Long_____with his friends. They ______the differences between British English and American English. A.has been sitting/has been discussing B. was sitting/were discussing C.has sat/have discussed Is sitting/are discussing 16. Listen! Someone______at the door. I ______it. A.is knocking/will open B.are knocking/will open C.knocks/open D.have knocked/open 17. Every day, John______rice and vegetables for lunch, but today he ____chicken soup and roasted beef. Today is his brother’s wedding. A.have/is having B.will have/will have C.has/is having D.had/had 18. It_____, so we can’t go to the beach at the moment. A.rains B.is raining C.will rain D.rained 19. My father______complete silence when he______. A.wants/is working B.wanted/worked C.wanted/works D.will want/worked 20. Since 2003 they_____their son every year. A.were visiting B.visit C.visited D.have visited 21. I’m sorry I can’t hear what you____because everybody_____so loudly now. A.have been saying/talks B.are saying/is talking C.will say/ has been talk D.said/were talking 22. I _____the same car for more than ten years. I______about buying a new one. A.have had/am thinking B.had had/was thinking C.have/will have thought D.had/would think 23. BMy best friends and I ______each other for over fifteen years. We still ____together once a week. A.knew/got B.will know/will get C.have known/get D.knows/are getting 24. The secretary______on the report for more than three hours. She hopes she may finish it by the lunch time. A.works B.has worked C.worked D.will work 25. Please turn off the stove. The water________for more than fifteen minutes. A.boils B.is boiling C.has been boiling D. will boil 26. The meeting______at 7:30 a.m tomorrow. A.was begining B.began C.will be begining D.has begun 27. They________tomorrow at 12:00 p.m. A.leave B.left C.has left D.are leaving 28. The river______ strongly after last night’s rain. A.flowed B.flows C.is now flowing D.will flow 29. He______for Chelsea this season. A.would play B.is playing C.played D.has played 30. The builders have______that everything will eb ready on time. A.promised B.promise C.promises D.promising 31. Yesterday, Lan_______him to put some shelves up. A.asked B.is asking C.ask D.was asked 32. Tom has______this story wasn’t completely true. A.admitting that B.was admitted that C.admitted that D.admit that Mong các bn giúp mik

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