A competent speaker of a language must have a(n)________ of these different styles.
This is the very room ______ I slept in that evening.
We talked about the things and persons ______ we remembered at school.
John said he’d been working in the office for an hour, ______ was true.
New York, ______ last year, is a nice city.
You can take any book ______ interests you best.