I am asked to write a TOEFL for the job of international volunteers at global poverty alleviation initiative at Copenhaga in Denmark.The test cost $50 .

$50 for a test in an international company?! come on bro.... no proper organisation that wants to alleviate poverty would ask for such!!!!

there are many global poverty alleviation organisation....all over the world.
post the whole info here of who contacted you...email, phone number, website link etc

here is a simple clue: volunteer shouldnt be paying to get these jobs, let alone from Europe. so be careful. who should you pay these $50 to? and how? whats their bank details? i use to live in Denmark... very easy to know who owns the bank account.

Here is the mail and information