我的一位大学老友昨天突然给我打电话。

An old friend of mine from college called me ___out ___of ___the ___blue yesterday.

收到你的来信，我喜出望外。

I was extremely happy to receive your letter ___out ___of ___the ___blue.

这份工作机会来得突然，让我欣喜若狂。

The job offer came ___out ___of ___the ___blue, and I was thrilled.