open something at page BrE
open something to page AmE

The Shadow thumbed its pages, on the possibility that the book would open readily at the page last used.

She opened it at the first empty page.

With trembling fingers he opened it at the last page, and groaned.

The book opened almost of its own accord at the page she had puzzled over so many times.

And then, as I opened my evening paper at the middle page, I got a shock.

She knelt on the floor beside Annie and opened the book at the first page.

I opened the album at the page with the missing photograph and showed it to the General.

Now he opened at the very first page.

Here's a story about you, photograph and all" and she thrust, before me the magazine, opened at the appropriate page.

Frances grinned, grabbing the novel and opening it at the marked page.