'dpkg-reconfigure locales' CAN'T SET LOCALE

Mathsniper

I have isntalled this locales

2. mathsniper:~# locale -a
3. C
4. en_HK
5. en_HK.iso88591
6. en_HK.utf8
7. en_US
8. en_US.iso88591
9. en_US.iso885915
10. en_US.utf8
11. ja_JP
12. ja_JP.eucjp
13. ja_JP.ujis
14. ja_JP.utf8
15. japanese
16. japanese.euc
17. POSIX
18. zh_CN
19. zh_CN.gb18030
20. zh_CN.gb2312
21. zh_CN.gbk
22. zh_CN.utf8
23. zh_HK
24. zh_HK.big5hkscs
25. zh_HK.utf8
26. zh_TW
27. zh_TW.big5
28. zh_TW.euctw
29. zh_TW.utf8

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And the default locales is en_HK. But now, I wanna remove

2. en_HK
3. en_HK.iso88591
4. en_HK.utf8

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And set the default locales is en_US. But it doesn't work. And `locale -a` hasn't changed. What's the problem? This problem make me confused. I can't use SCIM due to LOCALES!  :cry:
please help me to solve the problems... I have spent a week using computer and GOOGLE all time. But no answer found.  :cry: