29. He has lived in Beijing for 10 years. (对划线部分提问)

28. The bridge came into use in 2001. (同上)

27. China has changed greatly these years. (同上)

26. Millie left Beijing two days ago. (同上)

25. I bought the bag five months ago. (同上)

24. Kitty borrowed this book three weeks ago. (同上)

23. She came home a month ago. (同上)

22. He joined the Party last year. (同上)

21. The lamb died a few days ago. (同上)

20. The film started an hour ago. (同上)