酒店保证所有房间都干净整洁。

The hotel ___guarantees that all rooms are clean and tidy.

商店保证所有商品在30天内可以退换。

The store ___guarantees all products can be returned within 30 days.

这家公司保证产品在一年内免费维修。

The company ___guarantees free repairs for its products within one year.

质量认证不能保证产品永远不会出问题。

A quality certification is no ___guarantee that the product will never have issues.