"Jsi chytrá holka."

Translation: You are a smart girl.

[jesusalfonsor]

Duolingo accepts smart or bright but not intelligent.

[CHSL95]

Can we use clever instead of smart? And smart to express the word expensive? Or can I forget what my English teacher told me 10 years ago XD

[AgnusOinas]

We can certainly use clever. As for smart meaning expensive - I've never heard that and I don't see it in any dictionaries. The second major meaning of "smart" is "stylish" or "elegant".