What is the sky

What is the sky what the sky is blue what colour is the sky ? what is the sky?短文的中文 what is "pie in the sky" What color is the most persistent in the sky The sky is The sky is mine what is this in the sky错在哪里 英语翻译What is the sky?where is it?How high is it and what lies The sky is (g ) The sky is blue The sky is very