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giangloc2002
2 năm trước
Khi đun nóng $Stiren$ với $axit$ $sunfuric$ thu được sản phẩm như hình. Giải thích quá trình hình thành sản phẩm đó
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Exercise 5: Choose the best answer to complete each of the following sentences. 1. By the time you finish cooking, they ________ their homework. A. will have done B. are doing C. have been doing D. have done 2. Can you tell me how __________ ? A. they escaped B. they were escaped C. did they escape D. have they escaped 3. "Does Tom own that car?" "No, I think his brother ________ it now." A. has owned B. is owning C. owns D. can own 4. Fish _______ on the Earth for ages. A. exists B. are existing C. exist D. have existed 5. Firemen _________ to receive an increase in pay next month. A. will be B. are C. have been D. would be 6. How many times __________ him since he went to Hanoi? A. have you seen B. do you see C. did you see D. had you seen 7. He _________as a cashier for twenty-five years. Then he __________ and went to live in the country. A. worked-retired B. had been working-retired C. has worked-had retired D. had been working-had retired 8. He wrote to her a month ago, but I'm not sure _________ he since then. A. has not written B. didn't write C. was not writing D. was not written 9. How many lessons _________ before you passed your tests? A. did you have B. do you have C. have you had D. were you having 10. How ___________ to stop in time when that car shot out in font of you? A. did you manage B. were you managing C. do you manage D. had you managed

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