Dưới đây là các từ cần điền vào chỗ trống:

21. The man **said** that they **were working** on the road outside my house and that they **wanted** some water to make tea.
22. I **was listening** to the radio when you **rang** the bell first time, and that's why I **did not hear** you.
23. We **had finished** our homework before we left.
24. My sister **had already cleaned** the floor by the time my mother came back.
25. Where did you go after you **had finished** your homework?
26. The film **had started** for 5 minutes when we came into the cinema.
27. The story was more interesting than I **had expected**.
28. When Queen Victoria **died** in 1901, she **had reigned** for over 60 years.
29. The teacher **came** into the classroom unusually early and one of the boys who **was smoking** a cigarette had no time to put it out. So he **threw** it into the desk and **hoped** for the best. A little later the teacher **noticed** that smoke was rising from this desk.
30. Helen **was sewing** a blouse when I **arrived** and she **had sewn** for a long time because it **was** almost ready.
31. He **had been working** for a long time when I **came** in and he **was obviously working** for a long time.