It would be even better if by pressing CTRL + P (clean project) the IDE looked for the library in your HD and, if found, it imported the library automatically
EDIT: "wrong"; the IDE should not look for the library on your HD but simply in its own library list.
1.I want to prompt me which library name to tick when I haven't checked the library yet!!!
The easiest way. It is suggested by aeric, and build a library list yourself.
2.CTRL + P,It won't tell me when I haven't checked the library