1. Two for one.

买一赠一。

2. Buy two, get one free.

买二赠一。

3. With each shirt you get a gift of a pair of socks.

买一件衣服，送一双袜子。

4. Welcome to try our cake for free.

欢迎免费品尝我们的蛋糕。

5. Please have a taste of our free sample.

请尝尝我们的免费样品。