You are given an English sentence with a blank, and you need to predict the missing word. After completing, the whole sentence should be gramatically correct and non-ambiguous.

Ex Input:
directly afterwards the door was opened wide enough to admit her and when she had ____ through it was again shut without losing sight of her for an instant the concierge took a whistle from his pocket as soon as they entered the court and blew it

Ex Output:
passed

Ex Input:
maybe they were out of boys of the brand you wanted he walked jauntily away being hungry and the unfortunate matthew was left to do that which was harder for him than bearding a lion in its den walk up to a girl a strange girl ____ orphan girl

Ex Output:
an

Ex Input:
debray was occupied in repelling the insinuations of ____ friend who tried to persuade him

Ex Output:
a