She paid no attention to them, never once glanced back.

They glanced at each other once in a while, but kept silent.

He glanced once over his shoulder, then turned away again.

He glanced once through the sight and then set it back in its place.

She glanced once at the pipe then down to the floor.

She glanced once at the river, then quickly away again.

I glanced once at the heavy door, saw that it stood open.

Once inside he glanced around but nothing had been disturbed.

Bill glanced at his watch once or twice, but I took my time.

She glanced back once or twice, then looked straight forward.