一只大狗不知从哪里窜了出来，开始追球。

A huge dog ran ___out ___of ___nowhere and started chasing the ball.

这个问题的解决方案似乎是在我们开会时突然冒出来的。

The solution to the problem seemed to come ___out ___of ___nowhere during our meeting.

他突然出现在我身后，吓了我一跳。

He appeared ___out ___of ___nowhere right behind me and gave me a fright.