我需要买一瓶新的洗发水。

I need to buy a new bottle of ___shampoo.

弄湿头发后，涂抹一些洗发水并好好按摩。

After wetting your hair, apply some ___shampoo and massage it well.

我认为肥皂和洗发水在浴室里。

I think the soap and the ___shampoo are in the bathroom.