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Giải hệ phương trình {3/x-y -2/x+y=-7 {1/x-y +3/x+y=5
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1. ………..she ever………..part in a sports competition? – Yes, she has, a skiing competition. A. Has/ took B. Did/ take C. Has/ taken D. Have/ taken 2. My brother………….….home for 10 years. A. leaves B. has left C. have left D. left 3. We………to Singapore several times. A. were B. have never C. be D. have been 4. Linda …………….John since he left school. A. hasn’t met B. haven’t met C. hasn’t meet D. didn’t meet 5. We ……………… each other for a long time. A. hasn’t met B. haven’t met C. haven’t meet D. didn’t meet 6. ……….you ever………..about Carnival Festival? A. Has/ heard B. Have / heard C. Did/ heard D. Have / hear 7. My sister ……………this film 3 times. A. sees B. have seen C. has seen D. has saw 8. My father ……………any sports since last year. A. didn’t play B. haven’t played C. hasn’t played D. hasn’t play 9. He has learned English ……………4 years. A. for B. until C. in D. since 10. We ……………to New York. A. have never been B. never been C. never have been D. have been never

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