There's no such thing as a free ______.
Definition: said to emphasize that you cannot get something for nothing

I feel under the ______.
Definition: not completely well

Mary went totally ______ when she found out that he cheated.
Definition: to become extremely angry or excited

You can't teach an old ______ new tricks.
Definition: said to mean that it is very difficult to teach someone new skills or to change someone's habits or character

Don't cry over spilled ______.
Definition: it’s not helpful to be sad about something that has already happened

There's no such thing as a free ______. Definition: said to emphasize that you cannot get something for nothing