你可以拿这张发票去参加抽奖。

Nǐ kěyǐ ná zhè zhāng fāpiào qù cānjiā chōujiǎng.

You can use this receipt to enter the lucky draw.

别弄掉发票，我还没取货呢。

Bié nòngdiào fāpiào, wǒ hái méi qǔhuò ne.

Don’t lose the receipt—I haven’t picked up the goods yet.

请确保保存好你的购物发票。

Qǐng quèbǎo bǎochí hǎo nǐ de gòuwù fāpiào.

Please make sure to keep your shopping receipts.