Điền từ còn thiếu vào chỗ trống, hoàn thành câu

Khong spam nkee :< Lam ho tuii vs >< 21. He has been fishing................six o'clock. 22. They've been living in France ................eight years. 23. The pilots have been on strike................two months. 24. We've had terrible weather................Saturday. 25. I've known Tom................1990. 26. We have been waiting for the bus................half an hour. 27. She hasn't lost a match................April. 28. Things have changed................she's become headmaster. 29. The police have been looking for him................a month. 30. Our dog has been ill................two days. 31. I've been looking for this book................a long time. 32. I've been working................I got up. 33. The kettle has been boiling................ten minutes 34. They have been living in Madrid .................1972. 41. I haven't seen him for three years. It is because I haven't been there..............I left school. 42. I have been trying to mend this old fashioned car.................. hours. 43. One of my friends has been teaching in Tokyo................. three years. I haven't met him since last year. 44. I haven't enjoyed myself................two weeks since I heard that my final exam grades were low. 45. I know that you have never seen a lion.......... you were born. Then now I say that we can go to the zoo and see one. 46. The police have been looking for him for two weeks........... he escaped from the prison.