Cāicāi kàn!

猜猜看！

Guess what!

Notes:

猜(cāi): to guess

看(kàn): to look

Example:

A：你买什么了？

     Nǐ mǎi shénme le？

     What did you buy?

B：猜猜看！

     Cāicāi kàn! 

     Guess what!