11、must have watched
12、didn't think that
13、couldn't help crying
14、When asked why he had done this
15、had set off，could have caught
16、laughing and singing
17、exposed
18、is
19、Although
20、hopeful
11.must have watched
12. didn't think
13. couldn't help crying
14. When asked of why he have done that
15. had taken off could have caught
16. laughing and singing
17. exposed
18. had been
19. Although
20. hopeful
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