我们收到了几张可以在超市使用的代金券。

We received some ___vouchers that can be used at the supermarket.

这家餐厅的优惠券可以免费兑换一杯咖啡。

The restaurant's ___voucher can be redeemed for a free cup of coffee.

请出示您的购物凭证以便退款。

Please show your ___vouchers for the refund.