The box will do fine as a table.

这个箱子用作桌子还蛮不错。

You could do fine in the world if you put your mind to it.

在这个世界上，只要你认真做事，就能做好。

Come prepared and you will do fine.

来时要准备好，你就会做的很好的。

In world affairs, will do fine.

天下大事，必做于细。

I'm sure you'll do fine.

我相信你会做得很好。