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nhudg14
2 năm trước
Câu 5 ý b mình làm là 2n+3-2 chia hết cho 2n+1 Suy ra 2n+1 chia hết cho2n+1 Suy ra 1 chia hết cho d Suy ra 2n+1/2n+3 là phân số tối giản Mình làm thế được không ạ Xong mình vote 5 sao Cảm ơn nhiều Ạ Giúp mình với
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III. Circle the best option to complete each sentence: 1. She usually _____ two hours a day a. work b. is working c. works d. working 2. Don’t make noise. My mother _________ with her friends a. is talking b. was talking c. talks d. talked 3. Listen! They _________ about the exhibition . Let’s join them a. talk b. talked c. are talking d. have talked 4. Where _____ your sister born? a. were b. was c. did d. is 5. We _____ have white wine, but we _____ red wine a. didn’t/had b. don’t/had c. did/didn’t d. didn’t/have 6. When did you _________ see him? a. recently b. already c. last d. lately 7. I _________ a bath when the phone rang a. was having b. had c. am having d. have 8. I _____ her two week ago a. seen b. was seeing c. saw d. have seen 9. I _____ to his house in 1991 a. moved b. have been moving c. have moved d. was moving 10. He came into the room while they _________ television a. have watched b. watched c. were watching d. have been watching 11. I fell asleep when I _____ television a. am watching b. am being watched c. was watching d. All are correct 12. They _____________ last week a. didn’t come b. came not c. don’t come d. did come 13. Where are Geoff and Anne? _____________ in the garden a. They’re sitting b. They sitting c. There sitting d. They’re siting 14. It’s very cold today and _____ a. It’s snowing b. it snows c. its snowing d. it snowing 15. She goes to the library twice a week. She _____________ read books there a. never b. usually c. rarely d. once 16. At nine o’clock yesterday morning, we _____________ for the bus a. are waiting b. waited c. were waiting d. was waiting 17. Tom _________ his hand when he was cooking the dinner a. burnt b. was burning c. has burnt d. had burnt 18. He _________ me every Sunday, and we often go fishing together a. came to see b. comes to see c. will be coming to seed. All answer are correct 19. The phone rang while she _________ dinner a. cooks b. was cooking c. is cooking d. has cooked 20. My sister _________ trouble with her motobike now, so she has to take the bus to work a. have b. is having c. was having d. had 21. When my mum got home, _________ a. the dinner be cooked b. I was cooking dinner c. I am cooking dinner d. the dinner deing cooked 22. Emma and Katie usually _________ their grandmother at weekends a. have visited b. visits c. visit d. are visiting 23. Peter was reading a book by Mark Twain _________ his friends came a. while b. when c. during d. if 24. Look! That boy _________ an elephant over there a. fed b. was feeding c. feeds d. is feeding 25. He _________ in London at the moment a. studies b. has studied c. is studying d. will study

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