The hats are nine dollars.

这些帽子九美元。

同一单元的其他句子

• How much are these socks?这些袜子多少钱？
• The socks are two dollars.这双袜子两美元。
• I want to buy a blue shirt.我想买一件蓝色的衬衫。
• How much is that red skirt?那条红裙子多少钱？
• The shorts are on sale for five dollars.这条短裤打折卖五美元。