I. Fill in the blank with one question word
16. She doesn't know to behave in public.
17. You shouldn't quarrel with your friends when they are angry. You should know to keep silent.
18. The blue one and the red one, I don’t know to choose.
19. ‘1 need to see a doctor.’ ‘ for?’
20. He's a man opinion I respect.
1 how
2 how
3 which
4 what
5 wjpse
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