I'll be around.

我就在附近。/我会留在这里的。

A: Will I be able to meet you again?

我们还会再见面吗?

B: Of course. I'll be around.

当然了，我就在这儿附近。

(It) Doesn't fit.

不可能。/不合适。

A: Your wife said she went to visit her sister.

你妻子说去看她妹妹了。

B: It doesn't fit. My wife and her sister don't like each other.

不可能，她们姐妹俩关系不好。