You must choose the second-best policy according to the circumstances.

I can't do that, not under these circumstances.

I wish the circumstances were different.

Unavoidable circumstances kept me from doing that.

People are always blaming their circumstances for what they are. I don't believe in circumstances. The people who get on in this world are the people who get up and look for the circumstances they want, and if they can't find them, make them.

Plausibility changes with different circumstances.

She is in good circumstances with a large fortune.

Man is a creature of circumstances.

The Psychic Fair was cancelled due to unforeseen circumstances.

Tom died under mysterious circumstances.