Tìm các số nguyên x,y thỏa mãn : 3^x - y^3=1

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Giusp mình 15 câu này với, hứa vote 5 sao<3 1)Since Robert was living in Rome, I ______a word from him. A. hadn’t heard B. don’t hear C. didn’t hear D. haven’t heard 2) ______ you ______ with the book I lent you last week? A. Did ... finish B. Do ... finish C. Have ... finished D. Had ... finished 3) We _________ about those singers yet. A. haven’t heard B. have heard C. heard D. didn’t hear 4) I ________ to New York three times this year. A. have been B. was C. were D. had been 5) Two weeks ago, my uncle _______ me a new computer. A. buys B. bought C. is buying D. had bought 6) Ow! I _______ my finger. It’s bleeding. A. have cut B. cut C. had cut D. am cutting 7) Look at dark clouds! It _____________. A. is raining B. rains C. is going to rain D. will rain 8)I _________ at home now. 2 điểm A. stay B. stayed C. have stayed D. am staying 9)My mother can’t answer the phone. She _______ my father in the garden. A. is helping B. helps C. will help D. is going to help 10) Tomorrow she __________ my grandparents A. is going to visit B. will visit C. have visited D. visit 11)The last time I ___________ to Paris was in February. A. have gone B. went C. go D. will go 12)That’s a good film but I _________ it before. A. didn’t see B. don’t see C. haven’t seen D. hadn’t seen 13) After I________ lunch, I looked for my bag. A. had B. had had C. have has D. have had 14)He is very good at English. He has been studying English _______ six years. A. since B. for C. about D. at 15) The man got out of the car, _______ round to the back and opened the boot. A. walking B. walked C. walks D. walk