He saw Sara pass by once, but she didn't look outside.

He says that the Federation will stop by once every year to collect their cut.

She's walked by only once, alone and going nowhere in particular, it seemed.

Most places will come by once when you are eating and ask how everything is.

There's another one, but he kind of drifts by once in a while at night.

Or perhaps the Others come by once in a while.

And I'd like you to drop by once a week anyway, just to see how you're doing.

People who have no business here may stop by once, but they almost never come back.

Perhaps a dozen more have dropped by once or twice.

But there was really nothing he could do for them, except maybe have a cruiser stop by once in a while.