4、Modern machinery _______ been installed in this newly-built factory.

29. Twenty people were()wounded in the air crash.

28. Don’t forget( )the window before leaving the room.

27. Tom( )more than twenty pounds on the novel.

26. I fell and hurt myself while I()basketball yesterday

25. The boy is not happy at the new school. He has()friends there.

24. He is not seriously ill, only a()headache.

23. I’d like the teacher()classes are very interesting and creative..

22. I didn’t expect you to turn()at the meeting yesterday.

21. We worked hard and completed the task().

20. Once environmental damage(), it takes many years for the system to recover.