1.What were you doing when the UFO arrived?
2.in front of
3. make a milk shake
4. talk on the phone
5.cut hair
6. the Museum of Flight
7. the TV station
8. take off
9. walk down the street
10. at around ten o'clock
11.at the train station
12.think about
13.next to
14. for example
15. in modern American history
16. hear about
17. over 40
18. have fun
19. ask sb to do sth
20. in silence
21.take place
22.the World Trade Center
23.not all
24.as terrible as this
25.in space
26.all over the world
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