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thuhanguyet23
2 năm trước
Viết công thức cấu tạo của các chất có tên gọi sau:  ​a)  4-etyl-3,3-đimetylhextan b)  1-brom-2-clo-3-metylpentan c) 1,2-điclo-1-metylxiclohexan d) 2-metylbutan e) 2,2,3-trimetylpentan f)  2,2- điclo-3-etylpentan
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Exercise 8 1. They________ tomorrow at 12:30 a. will leave b. are leaving c. are going to leave d. leave 2. Someone________ at the door, can you answer it? a. knocks b. is knocking c. has knocked d. knocked 3. John________ at the moment, so he can't answer the telephone. a. works b. is working c. has worked d. will work 4. The river________ after last night's rain. a. flowed b. flows c. is flowing d. will flow 5. He________ for Chelsea this season. a. played b. is playing c. would play d. has played 6. We shall make a trip around the world when the opportunity________ itself to us. a. will present b. will have presented c. presents d. will be presenting 7. This pupil________ his best and ________ only one mistake in his dictation. a. made/did b. did/made c. made/made d. did/did 8. The holiday makers________ in the sunshine to get sunburnt. a. laid b. lied c. led d. laying 9. The snake________ one big egg last week. a. lay b. laid c. led d. laying 10. I'm afraid you________ number. a. have mistaken b. are with the wrong c. have the wrong d. made the wrong 11. I like looking at the pictures, but I ________ enough by lunch time. a. should have b. will have c. will have had d. have 12. I don't understand this sentence. What________? a. does mean this word b. have this word mean c. means this word d. does this word mean 13. John________ tennis once or twice a week. a. usually play b. in usually playing c. usually plays d. have usually played 14. It was noisy next door. Our neighbors________ a party a. had b. were having c. had had d. have had 15. It________ dark. Shall I turn on the light? a. is getting b. get c. got d. has got 16. I________ for Christine. Do you know where she is? a. look b. looked c. am looking d. looks 17. At 5 o'clock yesterday evening, I ________ my clothes. a. am ironing b. have ironed c. ironed d. was ironing 18. Are you ready, Ann? Yes, I________ a. am coming b. come c. came d. have came 19. Why________ at me like that? What's the matter? a. do you look b. have you looked c. did you look d. are you looking 20. I________ along the street when I suddenly heard footsteps behind me. a. was walking b. a walking c. walk d. walked

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