really get paid through online questionnaire??

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well...i was heard that doing some online questionnaires could earn extra money.it is a new way in China. so i decided to follow this. i've found some online questionnaire websites like paid online surveys free, permissionresearch paid, opinion world, test&vote,surveys.....etc...i was told the much websites on this u've signed up, there would be more chance to get the papers and paid...however...i searched as much websites as i could, then later,i've got only a few papers from them.after done these papers, nothing was paid, and no more papers either...i don't know why...any friends here has some ideas on this? maybe there is some key on getting more papers to do?? have u got any fee on online questionnaires??