stranger

当我打开门时，我看到一个陌生人站在外面。

When I opened the door, I saw a ___stranger standing outside.

那个陌生人走到我面前，问我是否能认出他。

The ___stranger came in front of me and asked if I could recognise him.

我不能就这么走到一个完全陌生的人面前开始和他们说话。

I can't just walk up to a complete ___stranger and start talking to them.