죠 is a contraction of 지요 which creates a tag question: V/adj (stem) + 죠?
시간이 참 빠르죠?
Time goes quickly, doesn’t it?
The weather’s great, isn’t it?
You’re angry with me, aren’t you?
Have you eaten? (I have no idea if you’ve eaten or not)
You already ate, right? (It’s just after lunch, or you’re walking out of a restaurant)
She’s pretty, isn’t she?
The weather’s cold isn’t it?