她向我们展示了她的护照作为身份证明。

She showed us her passport as ___proof of her identity.

你需要带来证明你住在镇上的证据才能获得借书证。

You need to bring ___proof that you live in the town to get a library card.

保留你的收据作为购买证明。

Keep your receipt as ___proof of purchase.