The doer of the action may not be mentioned in all passive voice sentences. For example, in a recent public rally, several slogans were raised against the Apex court. Here it is not mentioned who raised the slogans. Still, it is a complete sentence.
One more: Constitution demands that the wages be paid on skills rather than on gender, caste, color, or creed. Here there is no need to mention who pays the wages. Obviously, it is implied that wages are paid by those who employ the people.
One more: Constitution demands that the wages be paid on skills rather than on gender, caste, color, or creed. Here there is no need to mention who pays the wages. Obviously, it is implied that wages are paid by those who employ the people.



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