- How much is this necklace ?  / How much is this one ?
- How much are these earrings ?
- How much is that necklace ?
- How much are those earrings ?



* Which one ? The blue one .
* Which ones ? The yellow ones .
* Which one do you like better ?  I like the wool one better .
* I prefer  the leather one .
* Which one do you prefer ? I prefer the leather one better / more .


* How much is the computer ?
* Which one ?
* The small one . / The one .
* That' s expensive !