Sorry about posting these so late. My wife's grandmother had a medical scare that necessitated our leaving town to be with her. Thankfully, she pulled through.
The answer to last Thursday's TTPK is "boy": poster boy, boyfriend, tomboy.
The answer to last Friday's TTPK is "strip": landing strip, crash landing, Knots Landing.
The answer to last Saturday's TTPK is "call": phone call, last call, duck call.
The answer to last Sunday's TTPK is "limit": time limit, speed limit, limitless.