He looked rather untidy as there were two buttons _____ from his coat.

I’m not surprised that he became a writer. Even as a child he had a(n) __________imagination.

There was _____ woman in the room, sitting and looking at me in the dark.

Upon reading the notice all the staff of the company stood there        ,  looking     at each other. 

This is a______ but extremely difficult technology in the future.