Ⅳ. 完成句子,每空一词。
16. 这支钢笔不可能是刘颖的。她的钢笔是蓝色的。
This pen ______ ______ Liu Ying's. Her pen is blue.
17. 那位年轻女士经常听乡村音乐。
That young woman ______ ______ ______ ______ ______.
18. 他对这次会议似乎忧心忡忡。
He seemed to ______ ______ about the meeting.
19. 你最后一次把它放在哪里了?
Where ______ ______ ______ ______ it?
20. 足球可能还在学校教室里。
The football ______ ______ ______ in the classroom.

V.补全对话:选择方框中的情态动词完成下面的对话。
must might can't could
Woman:Look! There's something in the sky.
Man: It 21. ______ be a helicopter.
Woman:No,it 22. ______ be a helicopter. It's too big. It must be a UFO?
Man:A UFO? What's going on?
Woman:Look, now the UFO is landing…
Man:And there's a strange creature getting out. It 23. ______ be an alien.
Woman:And the alien is chasing the man!
Man:Can you guess what the man is doing?
Woman:He 24. ______ be running for exercises.
Man:But he's not wearing sports clothes.
Woman:Well,he 25. ______ be late for work.
Man:But he doesn't look worried.
Woman:Maybe we should call the police. Hey,wait a minute,what's that?
Man:Over there.
Woman:It's a woman with a camera.
Man:She 26. ______ be from the TV news.
Woman:No, look at all those other people. They're actors. Oh! They 27. ______ be making a movie.

Ⅰ. 语块积累。
请在横线上写出这些语块的英文表达：
1. 尽管________
2. 据说________
3. 至少________
4. 在我们一生中________
5. 潜在的力量________
6. 总体来说________
7. 一些________
8. 未解之谜________