Chia dạng đúng của từ trong ngoặc

21. She _________________ (read) a book when I entered the room.

22. They __________________ (not see) this movie before.

23. He __________________ (work) at this company for ten years.

24. Right now, the children __________________ (play) in the park.

25. She usually __________________ (wake) up at 6 AM.

26. When we arrived, they __________________ (already/eat) dinner.

27. By the time she comes, we __________________ (finish) our project.

28. He__________________ (watch) TV when the phone rang.

29. I __________________ (never/see) such a beautiful sunset before.

30. At this moment, she __________________ (write) an email to her friend.