Shane... (stare) at the woman for quite some time before he relazied who she was.
Susan was very happy because she.. (win) the first prize in the art competition.
Bill.... (work)as a sales assistant fore five years before he became an actor.

Shane had been staring at the woman for quite some time before he relazied who she was.Susan was very happy because she won the first prize in the art competition.Bill had been worked as a sales assistant for five years before he became an actor.

1. had been staring2. won3. had been working