B. Listen again. What does each advertisement say about the product?

(Lắng nghe một lần nữa. Mỗi quảng cáo nói gì về sản phẩm?)

1. If you buy one, you will (only pay 50% / get one free).

2. If you visit the website, you can (ask for a free sample / see videos of the product).

3. If you use it every day, your hair will be (stronger / straighter).

4. If you use it, it will (kill bacteria / reduce tooth decay).