9. They ………………………..…………………..(sell) their house several days ago. 10. John ………………………..………………..(work) for this company since 1980. 11. Linda is working in this department. She …………..…………..(work) here for two years. 12. Many people in this class …………..………..…...(see) this beautiful house several times. 13. They …………………..………..………(live) in London from 1970 to 1990. 14. They ……………………………..……….(live) in China since 2000. 15. We ……………………….……..…….(study) English at this school for a month. 16. Our present teacher ………………..…………..…..(live) in this city all of his life. 17. This boy ……………………………..……….(not / finish) his homework yet. 18. I ……………………..….... (speak) to him about your work several times already. 19. ………………………..….…you …………..………….……..(ever travel) to China before ? 20. he ……………………….….(receive) a letter just a few minutes ago. 21. I ……………………………..…………………(not / see) John recently. 22. It’s the third time you …………………..…………….……….(lose) your key. 23. This is one of the best books I ……………..…………….(ever read). 24. You …………………….………..……….(put) your book on my desk last night.