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2 năm trước
cho a+b+c=1 a,b,c khác 0 Chứng minh rằng (a+1/a)^2+(b+1/b)^2+(c+1/c)^2>33
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1. At 9 o’clock yesterday we ________ on the beach. A. are lying B. have lain C. lay D. were lying 2. The baby ________his food onto the floor and making his mother angry. A. always threw B. is always throwing C. has always thrown D. always throws 3. I would like ________to Africa. A. go B. to go C. going D. to going 4. It was kind ________you to help them. A. of B. from C. for D. to 5. Are you going abroad this summer? A. going overseas B. going on holiday C. going to another country D. A&C 6. ________is a building or room where people can go to look at paintings. A. Gallery B. Library C. University D. Gym 7. I brought back this cowboy hat as a ________of America. A. gift B. present C. award D. souvenir 8. While Angela was cleaning her room, she ________her lost ear-ring. A. is finding B. finds C. has found D. found 9. Why don’t you come ________for dinner? A. about B. over C. up D. upon 10. Will you pick me ________after the party? A. on B. over C. through D. up 11. Miss. Brown ________us last week while our teacher was ill. A. teaches B. is teaching C. was teaching D. has taught 12. You ________come and visit us again some time. A. should B. must C. need D. could 13. I’m usually free in the evening. A. tired B. relaxed C. not busy D. not at home 14. I picked up a copy of their summer travel________. A. paper B. magazine C. book D. brochure 15. While the choir ________Christmas carols, we were making them some cocoa. A. are singing B. were singing C. sang D. have sung 16. Would you like ________for a drink? A. go B. to go C. going D. went

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