I’d rather have a room of my own, however small it is, than ___ a room with others.[ ]

Maria has written two novels, both of ___ have beenmade into television series.

I’m going to be ______ engineer.

Some of my friends are interested in science, but none of them can tell ________.

The old rules have to be ______ because they only applied to the circumstances that existed when they were made a hundred years ago.