Read the sentence. i had to prove my identity to gain entrance to the building i was required to fill out an impressive number of forms. what is the best way to revise the sentence? i had to prove my identity to gain entrance to the building, i was required to fill out an impressive number of forms. i had to prove my identity to gain entrance to the building; i was required to fill out an impressive number of forms. i had to prove my identity, to gain entrance to the building i was required to fill out an impressive number of forms. i had to prove my identity: to gain entrance to the building i was required to fill out an impressive number of forms.