妈妈告诉我不要和陌生人说话。

My mom told me not to talk to ___strangers.

作为这个小镇的陌生人，他经常向当地人问路。

Being a ___stranger in this small town, he often asks locals for directions.

她对电脑完全是个陌生人，甚至连怎么开机都不知道。

She's a complete ___stranger to computers and doesn't even know how to turn them on.