I think you're doing the best you can under the circumstances.

Most of it he threw in the waste can under his desk.

"We're doing the best that we can under the circumstances."

I think we're doing everything we can under the circumstances.

He's doing the only thing he can under the circumstances.

I dropped it into the garbage can under the sink.

This can, under some conditions, amount to altering the condition of the ball.

"Basically, we're just trying to do the best we can under the circumstances."

The poor people who live here do the best they can under the circumstances.

"They've got to do the best they can under the circumstances."