That's it. I'm leaving.
もういい,帰る
That's just an excuse.
それは言い訳にすぎない
That's [It's] just what I (always) wanted.
ちょうど欲しかったものです
That's life.
それが人生さ
That's [Such is] life.
((略式))(あきらめて)人生そんなもんだ
That's Mary all over.
いかにもメアリーらしい
That's mine.
それは私のだ
That's more bother than it's worth.
それは手間の方が大きい
That's [This is] more like it.
ずっといい;よくなった
That's most kind of you.
本当にご親切さま