11. ………….(you / see) the news? You won't believe your eyes. 12. I …………………… (work) for big companies like this before. I know how they operate. 13. They ……………. (live) in New York for 3 years before they ……….. (move) to Seattle three months ago. 14. Debi …………… (study) for four hours when her father arrives. 15. By the time you received this letter yesterday, Dina …………….. (leave) for Algeria. 16. Everybody will be at the office at about 08:30 tomorrow as the meeting ………….. (start) at nine o'clock. 17. While climbing onto the mountain top, I…………….. (encounter) a strange animal which I'd never seen before. 18. When I ………………… (come) home this evening, my parents had gone out for a walk. 19. Builders …………………. (finish) the Millennium Dome by the end of the year 2000. 20. I was amazed when he accepted a drink, since I ………………... (always / assume) that he was a teetotaler. Lười không buồn làm . Mọi người làm giúp mình nha