@ShayShey
1- yes passport is a national ID.. pero i think may separate section ang passport.. kung wala kayong ibang ID.. its okay to leave this blank.. or put N/A..
2 - usual country of residence mo is where you live now.. sa section ng family members mo, dun mo ilagay kung iba ang current address nila..
3 - if its just temporary work/training/business travel - sa short travel sections mo na lang ilagay...
pero kung lumipat ka talga ng china for work.. kailangan mo pa ring i-declare.. write whatever you can remember..
although yun nga, hindi ka nmn hingian ng PCC china kasi less than 12 months..