While using ‘everybody’ ‘everyone’, ‘anybody’, and ‘each’ the pronoun of the masculine or the
feminine gender is used according to the context.
I shall be happy to help each of the boys in this practice.
But when the sex is not mentioned, we use the pronoun of the masculine gender. Example:
Anyone can qualify this exam if he tries.
Each of the six boys in the class has finished their tasks. (Incorrect)
Each of the six boys in the class has finished his task. (Correct)